diff --git a/yang/1.c b/yang/1.c
new file mode 100644
index 0000000..b395548
--- /dev/null
+++ b/yang/1.c
@@ -0,0 +1,58 @@
+#include <stdio.h>
+#include <time.h>
+
+void gaussianBlur(float src[5][5], float dst[5][5], int h, int w, float kernel[3][3]) {
+    int i,j, ki, kj;
+    for (i = 1; i < h - 1; i++) {
+        for (j = 1; j < w - 1; j++) {
+            float sum = 0.0;
+            for (ki = -1; ki <= 1; ki++) {
+                for (kj = -1; kj <= 1; kj++) {
+                    sum += src[i + ki][j + kj] * kernel[ki + 1][kj + 1];
+                }
+            }
+            dst[i][j] = sum; 
+        }
+    }
+}
+
+int main() {
+    float src[5][5] = {
+        {1, 2, 3, 4, 5},
+        {6, 7, 8, 9, 10},
+        {11, 12, 13, 14, 15},
+        {16, 17, 18, 19, 20},
+        {21, 22, 23, 24, 25}
+    };
+
+    float kernel[3][3] = {
+        {1 / 16.0, 2 / 16.0, 1 / 16.0},
+        {2 / 16.0, 4 / 16.0, 2 / 16.0},
+        {1 / 16.0, 2 / 16.0, 1 / 16.0}
+    };
+
+    int i, j;    
+    float dst[5][5];
+    for (i = 0; i < 5; i++){
+        for (j = 0; j < 5; j++){
+            dst[i][j] = 0.0;
+        }
+    }
+    
+    clock_t start, end;
+    start = clock();
+    gaussianBlur(src, dst, 5, 5, kernel);
+    end = clock();
+    double time = (double)(end - start) / CLOCKS_PER_SEC;
+
+    printf("Dst matrix:\n");
+    for (i = 0; i < 5; i++) {
+        for (j = 0; j < 5; j++) {
+            printf("%.2f ", dst[i][j]);
+        }
+        printf("\n");
+    }
+
+    printf("Time: %f s\n", time);
+    return 0;
+}