#include <stdio.h>

int main(){
    char c[3];
    scanf("%c%c%c", &c[0], &c[1], &c[2]);
    if(c[0] == c[1] && c[1] == c[2]){
        printf("Won");
        return 0;
    }
    printf("Lost");
}
#include <bits/stdc++.h>
using namespace std;
#define rep(i, start, n) for (int i = start; i < (n); i++)
using ll = long long;

int main()
{
    int V, S, T, D;
    cin >> V >> S >> T >> D;

    if(V*S <= D && D <= V*T) cout << "No" << endl;
    else cout << "Yes" << endl;

    return 0;
}