#include <iostream>
using namespace std;
int main() {
    int n;
    cin >> n;
    int abs_n = (n < 0) ? -n : n;
    cout << abs_n << endl;
    return 0;
}
/**************************************************************
	Problem: 1348
	User: fuhoubin
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/