#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
int main()
{
ll t,x;
while(cin>>t,t)
{
ll s1=0,s2=0,s=0;
while(t--)
{
cin>>x;
if(x>=0)
s1+=x;
else
s2+=-x;
// cout<<s1<<" "<<s2<<endl;
s+=abs(s1-s2);//s1=s2=0;
}
cout<<s<<endl;
}
return 0;
}
using namespace std;
typedef long long ll;
int main()
{
ll t,x;
while(cin>>t,t)
{
ll s1=0,s2=0,s=0;
while(t--)
{
cin>>x;
if(x>=0)
s1+=x;
else
s2+=-x;
// cout<<s1<<" "<<s2<<endl;
s+=abs(s1-s2);//s1=s2=0;
}
cout<<s<<endl;
}
return 0;
}
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