#include <iostream>

    using namespace std;

    int main()
    {
        int x1, x10, x60, rides;
        cin >> rides;
        x60 = rides/60;
        if ((rides % 60) >= 35)
        {
            x60 = x60 + 1;
        }
        else
        {
            x10 = (rides % 60)/10;
            if ((rides%60)%10 = 9)
            {
                x10 = x10 + 1;
            }
            else
            {
                x1 = (rides%60)%10;
            }
        }
        cout << x1 << x10 << x60;
        return 0;
    }