import sys #input = sys.stdin.readline #input = sys.stdin.buffer.readline #文字列はダメ #sys.setrecursionlimit(1000000) #import math #import bisect #import itertools #import random #from heapq import heapify, heappop, heappush from collections import defaultdict from collections import deque import copy #DeepCopy: hoge = [_[:] for _ in hogehoge] #from functools import lru_cache #@lru_cache(maxsize=None) MOD = pow(10,9) + 7 #MOD = 998244353 dx = [1,0,-1,0] dy = [0,1,0,-1] #dx8 = [1,1,0,-1,-1,-1,0,1] #dy8 = [0,1,1,1,0,-1,-1,-1] def main(): a,b,c = map(int,input().split()) ans = [] if c%a == 0: ans.append(c//a) if (b+c)%a == 0: ans.append((b+c)//a) if len(ans) == 0: print(-1) else: for ret in ans: print(ret) if __name__ == '__main__': main()