#include<bits/stdc++.h>
using namespace std;
#define cc long long
int main()
{
cc b,i;
cin>>b;
cc o[b],hh=0;
for( i=0;i<b;i++)
{
cin>>o[i];
if((o[i]%2)!=0)
{
hh=hh+o[i];
}
}
cout<<hh;
}
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