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20 lines
208 B
C++
20 lines
208 B
C++
#include <iostream>
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using namespace std;
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int main(){
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int a,b=0,c=0,e=2;
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cin >>a;
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for(int i=2;i<=a;i++){
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if(a%i!=0){
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b++;
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}
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}
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if(b==a-2){
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cout <<"yes";
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}
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else{
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cout <<"no";
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}
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return 0;
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}
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