#include<bits/stdc++.h>
using namespace std;
int main(){
    float a,b;
    cin>>a;
    if(a>0){
        b=a;
    } 
    if(a<0){
        b=0-a;
    } 
    printf("%.2f",b);
}
/**************************************************************
	Problem: 1676
	User: toughuatao1
	Language: C++
	Result: Accepted
	Time:17 ms
	Memory:2072 kb
****************************************************************/