V = list(map(int, input().split()))
vmax = max(V)
INF = 121
ans = INF
for i in range(1, 29):
    for j in range(i + 1, 30):
        for k in range(j + 1, 31):
            dp = [INF] * 31
            dp[0] = 0
            for x in [i, j, k]:
                for l in range(31 - x):
                    dp[l + x] = min(dp[l + x], dp[l] + 1)
            tmp = 0
            for v in V:
                tmp += dp[v]
            ans = min(ans, tmp)
print(ans)