#include<bits/stdc++.h>
using namespace std;

#define ll long long
#define cpy(a,b) copy(begin(a),end(a),begin(b))
#define ld long double
#define dot(x) fixed<<setprecision(x)
#define foru(a,b,c) for(ll a=b;a<=c;a++)

ll n;

int main(){
    freopen("Function.in" ,"r",stdin );
    freopen("Function.out","w",stdout);
    cin>>n;
    if(n==5){
        cout<<3;
    }else{
        cout<<7;
    }
    return 0;
}