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- #include<bits/stdc++.h>
- using namespace std;
- void prime(int n){
- int i;
- if(n < 2){
- printf("no\n");
- return;
- }
- for(i = 2; i*i <= n; i++){
- if(n % i == 0){
- printf("no\n");
- return;
- }
- }
- printf("yes\n");
- return;
- }
- int main(){
- int n;
- scanf("%d", &n);
- prime(n);
- return 0;
- }
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