#include <iostream>

using namespace std;

int main()
{
    int darab;
    cin >> darab;
    int i = 1;
    int adatok[darab];
    while (i<=darab){
        cin >> adatok[i];
        i++;
    }
    for (int j=1; j<=darab;j++)
        cout << adatok[j];
    return 0;
}