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  1. def find_min_beads(a, b, c, k):
  2. return max(k - 1, (a + b + c) // k)
  3.  
  4. a, b, c, k = map(int, input().split())
  5. print(find_min_beads(a, b, c, k))
  6.  
Success #stdin #stdout 0.03s 9876KB
stdin
2 4 6 3
stdout
4