问题出在哪里
代码如下：

#include<cstdio>
#include<iostream>
using namespace std;
int main()
{
	int n,a[4],b[4],s[4],min=9999999;
	scanf("%d",&n);
	for(int i=1;i<=3;i++)
	{
		scanf("%d%d",&a[i],&b[i])
	}
	for(int i=1;i<=3;i++)
	{
		int t2=n/a[i];
		double t1=n/a[i];
		double r=t1-t2;
		if(r!=0)
		{
			s[i]=n/a[i]+1;
		}
		else
		{
			s[i]=n/a[i];
		}
	}
	for(int i=1;i<=3;i++)
	{
		if(s[i]*b[i]<min)
               {
                    min=s[i]*b[i];
               }
	}
	printf("%d\n",min);
	return 0;	
} 

Thank you very much indeed!!!