#include <stdio.h>
int main () {
long long a, b, c, sum = 0;
scanf ("%lld %lld", &a, &b);
long long total = a * b + 1;
while (-- total && scanf("%lld", &c) != EOF) {
sum += c;
}
printf ("%lld", sum);
return 0;
} #include <stdio.h>
int main() {
int n, m;
if (scanf("%d %d", &n, &m) != 2 || 1 > n || 1 > m || n > 1000 || m > 1000) {
return 1;
}
int a;
long sum=0;
for (int i = 0; i < n; i += 1) {
for (int j = 0; j < m; j += 1) {
if (scanf("%d", &a) != 1 ||1 > a || a > 1000000000) {
return 1;
}
sum += a;
}
}
printf("%ld", sum);
return 0;
}