666爆零了求救

#include<bits/stdc++.h>
using namespace std;
int main(){
    freopen("jealousy.in","r",stdin);
    freopen("jealousy.out","w",stdout);
    int n,y,s,t;
    cin>>n>>y>>s>>t;
    for(int i=1;i<=n;i++){
        int start = (i-1)*s;
        int end = i*s;
        bool find1 = false;
        if(start >= y && (start - y) % t == 0){
            find1 = true;
        }
        bool find2 = false;
        if(end >= y && (end - y) % t == 0){
            find2 = true;
        }
        if(!find1 && !find2){
            cout<<"Yes";
            return 0;
        }
    }
    cout<<"No";
    return 0;
}