diff --git a/cxy_opt/1.c b/cxy_opt/1.c
new file mode 100644
index 0000000..2f912a8
--- /dev/null
+++ b/cxy_opt/1.c
@@ -0,0 +1,33 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+#include <string.h>
+#include "render.h"
+
+void applyGaussianBlur(float src[][MAT_SIZE], float dst[][MAT_SIZE], float kernel[3][3]);
+int main() {
+	float inputImage[MAT_SIZE][MAT_SIZE];
+	Render(inputImage);
+	float kernel[3][3] = {
+		{1.0f/16, 2.0f/16, 1.0f/16},
+		{2.0f/16, 4.0f/16, 2.0f/16},
+		{1.0f/16, 2.0f/16, 1.0f/16}
+	};
+	float outputImage[MAT_SIZE][MAT_SIZE]={0};
+	clock_t start = clock();
+	applyGaussianBlur(inputImage, outputImage, kernel);
+	clock_t end   = clock();
+	printf("Time: %lf s\n", (double)(end-start) / CLOCKS_PER_SEC);
+	Print(outputImage);
+}
+
+void applyGaussianBlur(float src[][MAT_SIZE], float dst[][MAT_SIZE], float kernel[3][3]) {
+	int i, j;
+	for(i=1; i<MAT_SIZE-1; i++)
+	for(j=1; j<MAT_SIZE-1; j++) {
+		dst[i][j] = 
+		src[i-1][j-1]*kernel[0][0]+src[i-1][j  ]*kernel[0][1]+src[i-1][j+1]*kernel[0][2]+
+		src[i  ][j-1]*kernel[1][0]+src[i  ][j  ]*kernel[1][1]+src[i  ][j+1]*kernel[1][2]+
+		src[i+1][j-1]*kernel[2][0]+src[i+1][j  ]*kernel[2][1]+src[i+1][j+1]*kernel[2][2];
+	}
+}