N=int(input())
A,B,C=map(int,input().split())
ans=0
for a in range(N):
    tmp=0
    if a*3>N:
        break
    m=N-a*3
    tmp+=A*a
    if 2*B>C:
        tmp+=B*(m//5)
    else:
        c=m//10
        tmp+=C*c
        m=m-c*10
        tmp+=B*(m//5)
    ans=max(ans,tmp)
print(ans)