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#include <iostream> #include <cmath> using namespace std; int s(int a, int b) { int summ = 0; bool h = 0; int i; while (a <= b) { i = 2; h = 0; while (i <= sqrt(a)) { if (a % i == 0) h = 1; i++; } if (h == 0) { summ += a; } a++; } return summ; } int main(){ int a, b; cin >> a >> b; cout << s(a, b); return 0; }
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