#include <iostream>
using namespace std;
void is_prime(int num){
int n=0;
if(num<2){
return;}
for(int i = 1;i<=num;i++){
if(num%i==0){
n=n+1;}}
if(n==2){
cout<<num<<"\n"; }
return;}
int main() {
is_prime(11);
return 0;
}
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