#include <bits/stdc++.h>
using namespace std;
int main()
{
vector<int>v ;
v.push_back(1);
v.push_back(2);
v.push_back(3);
v.push_back(4);
v.push_back(5);
v.push_back(6);
vector<int>::iterator it;
it=find(v.begin(),v.end(),4);
if(it!=v.end())
cout<<it-v.begin()<<endl;
return 0;
}