import sys

sys.setrecursionlimit(10 ** 6)
def LI(): return list(map(int, sys.stdin.readline().split()))

def main():
    vv=LI()
    mx=max(vv)+5
    ans=200
    for a in range(1,mx+1):
        for b in range(a+1, mx + 1):
            for c in range(b+1, mx + 1):
                dp=[200]*(mx+1)
                dp[0]=0
                for i in range(1,mx+1):
                    if i-c>=0:dp[i]=min(dp[i],dp[i-a]+1,dp[i-b]+1,dp[i-c]+1)
                    elif i-b>=0:dp[i]=min(dp[i],dp[i-a]+1,dp[i-b]+1)
                    elif i-a>=0:dp[i]=min(dp[i],dp[i-a]+1)
                cur=sum(dp[v] for v in vv)
                if cur<ans:ans=cur
    print(ans)

main()