#include<cstdio>
#include<iostream>
#include<cmath>
using namespace std;

int main(){
     int a,b,i;
     double c;
     cin >> a >> b;
     if(a > b){
          c = (a * a) - (b * b);
     }
     if(a < b){
          c = (b * b) - (a * a);
     }
     if (a == b){
          c = (a * a) + (b * b);
     }
     c = sqrt(c);
     printf("%f",c);
     return 0;
}