#include <stdio.h>

int main() {
    
    int m = 0, n = 0;
    scanf("%d%d", &m, &n);


    long arr[m][n];
    long sum = 0;//总和

    int i = 0, j = 0;
    for(i = 0; i < m; i++)
    {
        for(j = 0; j < n; j++)
        {
            scanf("%ld", &arr[i][j]);
            sum += arr[i][j];
        }
    }
    printf("%ld", sum);
    

    return 0;
}