v = list(map(int, input().split()))
ans = 120
for a in range(1, 31):
    for b in range(1, a):
        for c in range(1, b):
            cnt = 0
            for x in v:
                dp = [120] * (x + 35)
                dp[0] = 0
                for i in range(x):
                    dp[i + a] = min(dp[i + a], dp[i] + 1)
                    dp[i + b] = min(dp[i + b], dp[i] + 1)
                    dp[i + c] = min(dp[i + c], dp[i] + 1)
                cnt += dp[x]
            ans = min(ans, cnt)
print(ans)