#include<bits/stdc++.h>
using namespace std;
int main(){
    float a,x;
    cin>>a;
    if(a>0){
        x=a;
    } 
    if(a<0){
        x=0-a;
    }printf("%.2f",x);
}
/**************************************************************
	Problem: 1676
	User: sucongyi
	Language: C++
	Result: Accepted
	Time:18 ms
	Memory:2072 kb
****************************************************************/