def pageCount(n, p):
    
    # Write your code here
    start_count = 0
    end_count = 0
    start = 1
    end = n
    
    # From start
    i = 1
    while i <= end:
        
        if i >= p:
            break
        
        i = i + 2
        start_count += 1
    
    # From end
    if end % 2 == 0:
        j = end
    else:
        j = end - 1
    while j >= start:
        
        if j <= p:
            break
            
        j = j - 2
        end_count += 1
        
    return min(start_count, end_count)