def solve():
    import sys
    input = sys.stdin.read
    data = list(map(int, input().split()))
    
    N = data[0]
    H = data[1:]
    H.sort()
    
    p = 1
    ans = 0
    
    from heapq import heappush,heappop,heapify
    heapify(H)
    while H:
        u=heappop(H)
        u-=p
        p<<=1
        if u>0:heappush(H,u)
        ans+=1
    print(ans)

solve()