#include <stdio.h>
 #define coverage 350
int main() 
{
   int sq;
   int cans;
   printf("请输入面积\n");
   while(scanf("%d",&sq)==1)
   {
       cans=sq/coverage;
       cans+=((sq%coverage==0)) ?0:1;
       printf("you need %d %s of paint.\n",cans,cans==1 ?"can":"cans");
       printf("enter next value(q to quit):\n");
   }
   
	return 0;
}