调不出来

#include <bits/stdc++.h>

using namespace std;

struct apple{
    int x, y;
}ap[5100];

bool cmp(apple x, apple y){
    return x.y <= y.y;
}

int main(){
    int n, s, a, b;
    scanf("%d%d%d%d", &n, &s, &a, &b);
    int ans = 0;
    for(int i = 0;i < n;i++){
        scanf("%d%d", &ap[i].x, &ap[i].y);
    }
    sort(ap, ap + n, cmp);
    for(int i = 0;i < n;i++){
        if(ap[i].x > (a + b)) continue;
        if(s < ap[i].y) break;
        s -= ap[i].y;
        ans++;
    }
    cout << ans;
    return 0;
}

第三个点和第五个点RE，求助