OJ-Problems-Source/HDOJ/2401_autoAC.cpp

18 lines
311 B
C++
Raw Normal View History

#include <iostream>
using namespace std;
int main()
{
int n,w,d,s,cha,yuan,ans;
while((cin>>n>>w>>d>>s)>0)
{
yuan=w*n*(n-1)/2;
cha=yuan-s;
ans=cha/d;
if(!ans)
cout<<n<<endl;
else
cout<<ans<<endl;
}
return 0;
}