#include <algorithm>
#include <cstdio>
#include <iostream>
#include <map>
#include <cmath>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <string>
#include <vector>
#include <stdlib.h>
#include <stdio.h>
#include <bitset>
using namespace std;
#define FOR(I,A,B) for(int I = (A); I < (B); ++I)
typedef long long ll;

int main(){
  int a,b;
  cin>>a>>b;
  int c = max(a,b)*max(a,b)-min(a,b)*min(a,b);
  printf("%.08lf\n", sqrt(c));
  return 0;
}