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#include <iostream>
#include <math.h>
using namespace std;
bool foo(int n, int j) {
if (j == floor(sqrt(n) + 1))
return true;
else if (n % j == 0)
return false;
else
return foo(n, j+1);
}
int main() {
if (foo(13, 2))
cout << "Oui" << endl;
else
cout << "Non" << endl;
return 0;
}