#include <stdio.h>
 int func(int x) 
 {
 if(x==0)
 return 0;
 int left=1,right=0x7fffffff;
 while(1)
 {
 int mid=left+(right-left)/2;
 if(mid>x/mid)
 {
 right=mid-1;
 }else
 {
 if(mid+1>x/(mid+1))
 return mid;
 left=mid+1;
 }
 }
 }
 void main( )
 {
 printf("%d\n",func(200));
 }