#include <iostream>
#include <string>
#include <algorithm>
#include <cmath>


using namespace std;
int main() {
    int n;
    cin >> n;

    int y = 3;
    while (n >= 0) {
        long long m1 = min(y, 13);
        for (int m = 2; m < m1; m++) {
            for (int d = 1; d < m; d++) {
                n -= 1;
                if (n <= 0) {
                    cout << y << "/" << m << "/" << d;
                    return 0;
                }
            }
        }
        y++;
    }
}