// CPP program to illustrate
// Implementation of at() function
#include <iostream>
#include <vector>
using namespace std;
int main()
{
vector<int> myvector;
myvector.push_back(3);
myvector.push_back(4);
myvector.push_back(1);
myvector.push_back(7);
myvector.push_back(3);
cout << myvector.at(3);
return 0;
}