#include <stdio.h>#include <cstring>int n, top, num;char str[100];int getval(char str[]){int ans = 0;for(int i=1; i<7; ++i) ans = ans * 2 + str[i] - '0';ans = ans * (str[0] == '0' ? 1 : -1);return ans;}int main(){while(scanf("%d", &n), n != -1){int ans = 0;top = 0;for(int i=0; i<n; ++i){scanf("%d", &num);for(int j=1<<15; j; j>>=1){int x = ((j & num) > 0);str[top++] = '0' + x;if(top == 7){int tmp = getval(str);ans += tmp;top = 0;}}}printf("%dn", ans);}return 0;}
