#include <bits/stdc++.h>
#define rep(i, a, b) for (ll i = (ll)(a); i < (ll)(b); i++)
using namespace std;

typedef long long ll;

int main() {
    int n;
    cin >> n;
    if (n <= 100) {
        cout << "Milk" << endl;
    } else {
        cout << "Difficult" << endl;
    }
}