不会的看我！！！

#include <bits/stdc++.h>
using namespace std;
int main()
{
    int a,b,x1,y1,x2,y2,x3,y3;
	cin>>a>>b;
    
	cin>>x1>>y1;
    cin>>x2>>y2;
    cin>>x3>>y3;
    
	if( (b/y1)*x1>=a ) cout<<"YES";
    else if( (b/y2)*x2>=a ) cout<<"YES";
    else if( (b/y3)*x3>=a ) cout<<"YES";
	else cout<<"NO";

	return 0;
}