21 lines
251 B
C++
21 lines
251 B
C++
#include<iostream>
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#include<algorithm>
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using namespace std;
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int main()
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{
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cin.tie(0);
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int n;
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while(cin>>n&&n)
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{
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long long ans=0,a,last=0;
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for(int i=0;i<n;i++)
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{
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cin>>a;
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ans+=abs(last);
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last+=a;
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}
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cout<<ans<<"\n";
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}
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return 0;
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}
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