lsV = list(map(int,input().split()))
#30**3で全探索A,B,C
#A,B,CをつかってVを作るDP
ans = float('INF')
for i in range(1,29):
    for j in range(i+1,30):
        for k in range(j+1,31):
            dp = [float('INF')]*(30+1)
            dp[0] = 0
            lsABC = [i,j,k]
            for l in lsABC:
                for m in range(31):
                    if m+l < 31:
                        dp[m+l] = min(dp[m+l],dp[m]+1)
            cnt = 0
            for V in lsV:
                cnt += dp[V]
            ans = min(cnt,ans)
print(ans)