poj 2980 Do it!

#include<iostream>#include<cstdio>using namespace std;int a,b,c,r;inline int ceiling(int a,int b){if(a<0)return 0;if(a%b==0)return a/b;return a/b+1;}int main(){int ans;while(scanf("%d%d%d%d",&a,&b,&c,&r),a+b+c+r){int n=ceiling(100,r+2),tmp;ans=1000000;for(int i=0;i<=n;i++){tmp=ceiling(100,r)*c;tmp+=(i+ceiling((100-(r+2)*i),r))*a;tmp+=(i+ceiling((100-(r-1)*i),r))*b;if(tmp<ans)ans=tmp;}printf("%dn",ans);}return 0;}