V = list(map(int, input().split()))
ans = 1 << 30
for a in range(1, 31):
    for b in range(1, 31):
        for c in range(1, 31):
            dp = [1 << 30] * 31
            dp[0] = 0
            for x in [a, b, c]:
                for i in range(x, 31):
                    dp[i] = min(dp[i], dp[i - x] + 1)
            tot = 0
            for v in V:
                tot += dp[v]
            ans = min(ans, tot)
print(ans)