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#include <iostream> #include <cmath> using namespace std; bool IsPrime(int x) { float b; int l = 0; b = sqrt(x); for (int i = 2; i <= b; i++) { if (x % i == 0) { return 0; } } return 1; } int summe(int a, int b) { int summ = 0; for (int y = a; y <= b; y++) { if (IsPrime(y) == 1) summ += y; } return summ; } int main() { int a, b; cin >> a >> b; cout << summe(a,b); }
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