#include<iostream>
#include<cstdio>
#include<cstring>
#include<algorithm>
#include<cmath>
#include<vector>
#include<queue>
using namespace std;

#define X first
#define Y second

typedef pair<int,int> pii;
typedef long long LL;
const char nl = '\n';
const int N = 1e6+10;
const int M = 1e6+10;
int n,m;

void solve(){
	LL x;
	cin >> x;
	if(1<=x && x<=7)cout << "very easy";
	else if(8<=x && x<=233)cout << "easy";
	else if(234<=x && x<=10032)cout << "medium";
	else if(10033<=x && x<=114514)cout << "hard";
	else if(114515<=x && x<=1919810)cout << "very hard";
	else if(x > 1919810)cout << "can not imagine";
}

int main(){
	ios::sync_with_stdio(false);
	cin.tie(0),cout.tie(0);

	solve();
}