$#csaltv$

Code C++:

#include<bits/stdc++.h>
using namespace std;
int main() {
    int n;
    cin>>n;
    int cuoi=abs(n%10);             
    if (n>=10 && n<=99 && (cuoi==2 || cuoi==3 || cuoi==5 || cuoi==7))cout<<1;
    else cout<<0;
}