#include<bits/stdc++.h>
using namespace std;
const int N = 1e5 + 1;
int main()
{
int n;
cin >> n;
int arr[n];
long long sum = 0;
for(int i = 0; i < n; i++)
{
scanf("%d",arr + i);
sum += arr[i];
}
//sum = abs(sum);
cout << (sum>0?sum:-1*sum);
}
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