from collections import deque, defaultdict, Counter from bisect import bisect_left, bisect_right, insort from itertools import permutations, combinations, groupby from heapq import heappop, heappush import math, sys input = lambda: sys.stdin.readline().rstrip("\r\n") def printl(li, sep=" "): print(sep.join(map(str, li))) def yn(flag): print(Yes if flag else No) _int = lambda x: int(x)-1 MOD = 998244353 #10**9+7 INF = 1<<60 Yes, No = "Yes", "No" N = 7 T = list(map(int, input().split())) s = 0 t = 0 for i in range(N): s += T[i] if T[i] == -1: t = 1 if s > 6000 or t: print(-1) else: print(6000-s)