N = int(input())
H = list(map(int, input().split()))
H.sort()
atk = 1
ans = 0
while any(h > 0 for h in H):
    mi = -1
    for i in range(N):
        if H[i] > 0 and mi == -1:
            mi = i
        if H[i] > 0 and H[i] & atk:
            H[i] -= atk
            break
    else:
        assert mi != -1
        H[mi] -= atk
    atk <<= 1
    atk = min(atk, 10**18)
    ans += 1
print(ans)