uva 11461

#include<cstdio>#include<cstring>using namespace std;int main(){int a,b;while(~scanf("%d%d",&a,&b)&&(a+b)){int l=-1,r=-1;for(int i=1;;i++){if(l==-1&&i*i>=a)l=i;if(i*i>b){    r=i;    break;}}printf("%d\n",r-l);}}