#include <iostream>
#include <string>
using namespace std;

int main()
{
    int n = 0;
    while(n <= 0) {
        cin >> n;
        if (!cin.good()) {
        	cin.clear();
        	string ignore;
        	cin >> ignore;
        	continue;
        }
        cout << n << endl;
    }
    return 0;
}