import sys
read = sys.stdin.read
readline = sys.stdin.readline
readlines = sys.stdin.readlines
import itertools

*V, = map(int, read().split())

def solve(A, B, C):
  INF = 100
  dp = [INF] * 31
  dp[0] = 0
  for value in [A, B, C]:
    for n in range(31 - value):
      x = dp[n] + 1
      if dp[n + value] > x:
        dp[n + value] = x
  return sum(dp[v] for v in V)

ans = min(solve(A, B, C) for A, B, C in itertools.combinations(range(1, 31), 3))
print(ans)