V = list(map(int,input().split()))
ans = sum(V)
M = 31
for i in range(1,M):
    for j in range(1,M):
        for k in range(1,M):
            cost = [1000]*M
            cost[0] = 0
            for t in ((i,j,k)):
                for l in range(M):
                    if cost[l] == 1000:
                        continue
                    if l+t < M:
                        cost[l+t] = min(cost[l+t],cost[l]+1)
            count = 0
            for v in V:
                count += cost[v]
            ans = min(ans,count)
print(ans)