import sys

data=1024-int(sys.stdin.readline())
m64=int(data/64)
m16=int((data-64*m64)/16)
m4=int((data-64*m64-16*m16)/4)
m1=data-64*m64-16*m16-4*m4

# print(m64,m16,m4,m1)

print(m64+m16+m4+m1)