H, W = map(int,input().split())

W = abs(W)

ans = 0

ans += max(0, W)

for i in range(H-W,0,-1) :
    ans += 1 + (W-i)//(max(1, i-1)) + ((W-i) % (max(1,i-1)) != 0)
    #print(1 + (W-i)//(max(1, i-1)) + ((W-i) % (max(1,i-1)) != 0))

print(ans)