cái này phải là python

import sys
sys.stdin = open('Tiendien.inp','r')
sys.stdout = open('Tiendien.out','w')

n = int(input())
if 1<=n<=50:
    print(n*1500)
elif n<=100:
    print(50*1500+(n-50)*1800)
elif n<=150:
    print(50*1500+50*1800+(n-100)*2000)
elif n<=200:
    print(50*1500+50*1800+50*2000+(n-150)*2200)
else:
    print(50*1500+50*1800+50*2000+50*2200+(n-200)*2500)