D = int(input())

for i in range(60, 0, -1):
    
    x = 1
    
    y = D
    
    while x + 1 < y:
        
        z = (x + y) // 2
        
        Z = z
        
        a = 0
        
        for _ in range(i):
            
            a += z
            
            z //= 2
        
        
        if a >= D:
            
            y = Z
            
        else:
            
            x = Z
        

        
    a = 0
    z = x + 1
    for _ in range(i):
        
        a += z
        
        z //= 2
        
    if a == D:
        
        print(x + 1)
        
        exit()