#include <stdio.h>

int main() {
    int n, m = 0;
    int sum = 0;
    int arr[10][10] = {0};
    scanf("%d %d",&n,&m);
    for (int i = 0; i < m; i++) {
        for (int j = 0; j < n; j++) {
            scanf("%d",&arr[i][j]);
            if (arr[i][j] > 0) {
                sum+= arr[i][j];
            }
        }
    }
    printf("%d",sum);
    return 0;
}