#include <stdio.h> #include<stdlib.h> int** arr(int m, int n) { int** arr = (int**)malloc(sizeof(int*)*m); for (int i = 0; i < m; i++) { arr[i] = (int*)malloc(n * sizeof(int)); if (arr[i] == NULL) { for (int k = 0; k < i; k++) { free(arr[k]); } free(arr); return NULL; } for (int j = 0; j < n; j++) { scanf("%d", &arr[i][j]); } } return arr; } long long sum(int** arr, int m, int n) { long long sum = 0; for (int i = 0; i < m; i++) { for (int j = 0; j < n; j++) { sum += arr[i][j]; } } return sum; } int main() { int m, n; long long int ans; scanf("%d %d", &m, &n); int** arr1 = (int**)malloc(m * (sizeof(int*))); arr1 = arr( m, n); ans = sum(arr1, m, n); printf("%lld", ans); for (int i=0; i<m; i++) { free(arr1[i]); } free(arr1); return 0; }