【題目敘述】https://atcoder.jp/contests/abc164/tasks/abc164_b
#include <iostream>
using namespace std;
int a, b, c, d;
int main() {
cin >> a >> b >> c >> d;
while (1){
c -= b;
if (c <= 0){
cout << "Yes\n";
break;
}
a -= d;
if (a <= 0){
cout << "No\n";
break;
}
}
}