#include<bits/stdc++.h> using namespace std; int issu(int n) { if (n == 1 || n == 0) { return 0; } for (int i = 2; i <= sqrt(n); i++) { if (n%i == 0) { return 0; } } return 1; } int main() { int a, b; while (cin >> a >> b){ if (a > b) { a = a ^ b; b = a ^ b; a = a ^ b; } int sum = 0; for (int i = a + 1; i < b; i++) { if (issu(i)) { sum += i; } } cout << sum<<endl; } } |
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