// editor3
#include <stdio.h>

int matrixSum(int rows, int cols, int matrix[rows][cols]) {
    long long sum = 0;
    for (int i = 0; i < rows; i++) {
        for (int j = 0; j < cols; j++) {
            sum += matrix[i][j];
        }
    }
    return sum;
}
int main() {
    int m, n;
    
    if (scanf("%d %d", &m, &n) != 2 || m < -10 || m > 10 || n < -10 || n > 10) {
        printf("Invalid input for matrix dimensions\n");
        return 1;
    }
    if (m < 0 || n < 0) {
        printf("Invalid input for matrix dimensions\n");
        return 1;
    }
    int matrix[m];
    
    for (int i = 0; i < m; i++) {
        for (int j = 0; j < n; j++) {
            int element;
            if (scanf("%d", &element) != 1 || element < -1000 || element > 1000) {
                printf("Invalid input for matrix element\n");
            return 1;
            }
            matrix[i][j] = element;
        }
    }
    printf("%lld\n", matrixSum(m, n, matrix));
    
    return 0;
}