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#include <bits/stdc++.h>
using namespace std;
int number[1001][1001];
bool zhishu(int num) {
if (num > 1) {
for (int i = 2; i <= sqrt(num); ++i) {
if (num % i == 0) {
return false;
}
}
return true;
}
return false;
}
int main() {
int n, m;
while (cin >> n >> m) {
long long result = 0;
for (int i = 1; i <= n; ++i) {
for (int j = 1; j <= m; ++j) {
 ...
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