#include <stdio.h>
#include <stdlib.h>
#define DEBUG 0
int main ( int argc , char * argv[] ) {
while ( 1 ) {
int n;
scanf("%d" , &n);
if ( n == 0 )
break;
int m = n / 2;
int i = 0;
int sum = 0;
for ( i = 0 ; i < n ; i++ ) {
int x;
scanf("%d" , &x);
if ( m == 0 ) {
sum += x;
}
else {
m--;
}
}
printf("%d\n" , sum);
}
return 0;
}
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