Codeforces Beta Round #69 (Div. 2 Only)

A

 1 #include<bits/stdc++.h>
 2 using namespace std;
 3 #define lson l,mid,rt<<1
 4 #define rson mid+1,r,rt<<1|1
 5 #define sqr(x) ((x)*(x))
 6 #define pb push_back
 7 #define eb emplace_back
 8 #define maxn 1000006
 9 #define eps 1e-8
10 #define pi acos(-1.0)
11 #define rep(k,i,j) for(int k=i;k<j;k++)
12 typedef long long ll;
13 typedef unsigned long long ull;
14 
15 
16 int main(){
17     #ifndef ONLINE_JUDGE
18      //   freopen("input.txt","r",stdin);
19     #endif
20     std::ios::sync_with_stdio(false);
21     int n,m;
22     cin>>n>>m;
23     for(int i=n+1;;i++){
24         int flag=1;
25         int j;
26         for(j=2;j<i;j++){
27             if(i%j==0){
28                 break;
29             }
30         }
31         if(j==i) {
32             if(i==m) cout<<"YES"<<endl;
33             else {
34                 cout<<"NO"<<endl;
35             }
36             break;
37         }
38     }
39 }
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