diff --git a/bench/cec2020/inputData.go b/bench/cec2020/inputData.go
index 82708d5..88ba390 100644
--- a/bench/cec2020/inputData.go
+++ b/bench/cec2020/inputData.go
@@ -18,8 +18,9 @@ var inputData embed.FS
 
 // LoadInputData loads matrices and shift/rotation/shuffle input data and
 // returns them as maps.
-func LoadInputData(nx int) map[int][][]float64 {
+func LoadInputData(nx int) (map[int][][]float64, map[int][][]float64) {
 	matrices := make(map[int][][]float64)
+	shiftData := make(map[int][][]float64)
 
 	prefix := "input_data"
 
@@ -28,6 +29,7 @@ func LoadInputData(nx int) map[int][][]float64 {
 
 	for _, v := range funcNums {
 		fnameMatrix := fmt.Sprintf("%s/M_%d_D%d.txt", prefix, v, nx)
+		fnameShift := fmt.Sprintf("%s/shift_data_%d.txt", prefix, v)
 
 		{
 			matrix, err := inputData.Open(fnameMatrix)
@@ -42,9 +44,23 @@ func LoadInputData(nx int) map[int][][]float64 {
 
 			matrices[v] = m
 		}
+
+		{
+			shift, err := inputData.Open(fnameShift)
+			if err != nil {
+				log.Printf("shift: could not read %s, err: %q\n", fnameShift, err)
+				continue
+			}
+
+			defer shift.Close()
+
+			s := parseShiftData(shift, nx)
+
+			shiftData[v] = s
+		}
 	}
 
-	return matrices
+	return matrices, shiftData
 }
 
 func parseMatrix(f fs.File, dim int) [][]float64 {
@@ -79,3 +95,35 @@ func parseMatrix(f fs.File, dim int) [][]float64 {
 
 	return fMatrix
 }
+
+func parseShiftData(f fs.File, dim int) [][]float64 {
+	if f == nil {
+		log.Fatalln("shift file is nil, exiting...")
+	}
+
+	shrows := make([]string, 0, dim)
+	fSh := make([][]float64, 0, dim)
+	scanner := bufio.NewScanner(f)
+
+	for scanner.Scan() {
+		shrows = append(shrows, scanner.Text())
+	}
+
+	for _, r := range shrows {
+		row := strings.Fields(r)
+		flrow := make([]float64, 0, len(row))
+
+		for _, col := range row {
+			fl, err := strconv.ParseFloat(col, 64)
+			if err != nil {
+				log.Fatalf("parseShiftData: could not parse value to float64, col: %s, error: %q, bailing...", col, err)
+			}
+
+			flrow = append(flrow, fl)
+		}
+
+		fSh = append(fSh, flrow)
+	}
+
+	return fSh
+}
diff --git a/bench/cec2020/inputData_test.go b/bench/cec2020/inputData_test.go
index ed5f929..70a984e 100644
--- a/bench/cec2020/inputData_test.go
+++ b/bench/cec2020/inputData_test.go
@@ -10,18 +10,34 @@ import (
 func TestLoadInputData(t *testing.T) {
 	dim := 10
 	fnum := 1
-	m := LoadInputData(dim)
-	want := -0.6013070130189602
-	got := m[fnum][0][0]
+	m, s := LoadInputData(dim)
+	wantM := -0.6013070130189602
+	gotM := m[fnum][0][0]
 
-	if want != got {
-		t.Errorf("unexpected result, want: %v, got: %v", want, got)
+	// test matrix data.
+	if wantM != gotM {
+		t.Errorf("unexpected result, want: %v, got: %v", wantM, gotM)
 	}
 
-	want = 9.2845625214477390e-01
-	got = m[fnum][1][1]
+	wantM = 9.2845625214477390e-01
+	gotM = m[fnum][1][1]
 
-	if want != got {
-		t.Errorf("unexpected result, want: %v, got: %v", want, got)
+	if wantM != gotM {
+		t.Errorf("unexpected result, want: %v, got: %v", wantM, gotM)
+	}
+
+	// test shiftData.
+	wantS := -70.42955971808618
+	gotS := s[fnum][0][1]
+
+	if wantS != gotS {
+		t.Errorf("unexpected result, want: %v, got: %v", wantS, gotS)
+	}
+
+	wantS = 36.645777950364064
+	gotS = s[fnum][0][10]
+
+	if wantS != gotS {
+		t.Errorf("unexpected result, want: %v, got: %v", wantS, gotS)
 	}
 }