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  1. def minimum_beads(a, b, c, k):
  2. return max(a, b, c) * (k - 1) + 1
  3.  
  4. a, b, c, k = map(int, input().split())
  5. print(minimum_beads(a, b, c, k))
  6.  
Success #stdin #stdout 0.04s 9784KB
stdin
2 4 6 3
stdout
13