#include <stdio.h>
#include <stdlib.h>

int matrix[20][20]= {{8, 2, 22, 97, 38, 15, 0, 40, 0, 75, 4, 5, 7, 78, 52, 12, 50, 77, 91, 8},
					{49, 49, 99, 40, 17, 81, 18, 57, 60, 87, 17, 40, 98, 43, 69, 48, 4, 56, 62, 0},
					{81, 49, 31, 73, 55, 79, 14, 29, 93, 71, 40, 67, 53, 88, 30, 3, 49, 13, 36, 65},
					{52, 70, 95, 23, 4, 60, 11, 42, 69, 24, 68, 56, 01, 32, 56, 71, 37, 02, 36, 91},
					{22, 31, 16, 71, 51, 67, 63, 89, 41, 92, 36, 54, 22, 40, 40, 28, 66, 33, 13, 80},
					{24, 47, 32, 60, 99, 3, 45, 2, 44, 75, 33, 53, 78, 36, 84, 20, 35, 17, 12, 50},
					{32, 98, 81, 28, 64, 23, 67, 10, 26, 38, 40, 67, 59, 54, 70, 66, 18, 38, 64, 70},
					{67, 26, 20, 68, 2, 62, 12, 20, 95, 63, 94, 39, 63, 8, 40, 91, 66, 49, 94, 21},
					{24, 55, 58, 5, 66, 73, 99, 26, 97, 17, 78, 78, 96, 83, 14, 88, 34, 89, 63, 72},
					{21, 36, 23, 9, 75, 0, 76, 44, 20, 45, 35, 14, 0, 61, 33, 97, 34, 31, 33, 95},
					{78, 17, 53, 28, 22, 75, 31, 67, 15, 94, 3, 80, 4, 62, 16, 14, 9, 53, 56, 92},
					{16, 39, 5, 42, 96, 35, 31, 47, 55, 58, 88, 24, 0, 17, 54, 24, 36, 29, 85, 57},
					{86, 56, 0, 48, 35, 71, 89, 7, 5, 44, 44, 37, 44, 60, 21, 58, 51, 54, 17, 58},
					{19, 80, 81, 68, 5, 94, 47, 69, 28, 73, 92, 13, 86, 52, 17, 77, 04, 89, 55, 40},
					{04, 52, 8, 83, 97, 35, 99, 16, 7, 97, 57, 32, 16, 26, 26, 79, 33, 27, 98, 66},
					{88, 36, 68, 87, 57, 62, 20, 72, 3, 46, 33, 67, 46, 55, 12, 32, 63, 93, 53, 69},
					{4, 42, 16, 73, 38, 25, 39, 11, 24, 94, 72, 18, 8, 46, 29, 32, 40, 62, 76, 36},
					{20, 69, 36, 41, 72, 30, 23, 88, 34, 62, 99, 69, 82, 67, 59, 85, 74, 4, 36, 16},
					{20, 73, 35, 29, 78, 31, 90, 1, 74, 31, 49, 71, 48, 86, 81, 16, 23, 57, 5, 54},
					{1, 70, 54, 71, 83, 51, 54, 69, 16, 92, 33, 48, 61, 43, 52, 01, 89, 19, 67, 48}};

int parseMatrix(int mat[20][20]){
	int maxi, i, j, k, c = 0;
	int prod = 1;
	for(i; i < 20; i++){
		for(j; j < 16; j++){
			k = j;
			prod = 1;
			for(k; k<j+4; k++)
				printf("(%d,%d)\n", i, k);
				prod*=mat[i][k];
			if(prod > maxi)
				maxi=prod;
		}
	}
	/*
	for(j=0; j < 20; j++){
		for(i=0; i < 16; i++){
			k = i;
			prod = 1;
			for(k; k<k+4; k++)
				prod*=mat[k][j];
			if(prod > maxi)
				maxi=prod;
		}
	}
	for(i=0; i < 16; i++){
		for(j=0; j < 16; j++){
			prod = 1;
			for(c = 0; c < 4; c++)
				prod*=mat[i+c][j+c];
			if(prod > maxi)
				maxi=prod;
		}
	}
	
	for(i=0; i < 16; i++){
		for(j=19; j > 0; j--){
			prod = 1;
			for(c = 0; c < 4; c++)
				prod*=mat[i-c][j-c];
			if(prod > maxi)
				maxi=prod;
		}
	}
	*/
	return maxi;
}


int main(){
	int ans = parseMatrix(matrix);
	printf("%d\n", ans);
	return 0;
}