# x = input()
# s = 0
# for i in range(1, len(x)):
# if x[i-1] == x[i]:
# s += 5
# else :
# s += 10
#
# print(s+10)
a = int(input())
b = 0
if a <= 500:
b = a * 70 / 100
elif 500 < a and a <= 1500:
b = 350 + (a - 500) * 40 / 100
elif 1500 < a and a <= 4500:
b = 750 + (a - 1500) * 15 / 100
elif 4500 < a and a <= 10000:
b = 1200 + (a - 4500) * 5 / 100
else :
b = 1475 + (a - 10000) * 2 / 100
print('%.0f' %b)