#include<bits/stdc++.h>
using namespace std;
double a;
int main(){
	int n,m,k=0,j;
	cin>>n;
	if(n<0){
	    n=0-n;
	}
	cout<<n;
//	printf("%.1f\n",a); 
}
/**************************************************************
	Problem: 1348
	User: zhengzihao
	Language: C++
	Result: Accepted
	Time:9 ms
	Memory:2072 kb
****************************************************************/