spiciness = int(input())
if spiciness < 10:
    water = 0
elif spiciness <= 30:
    water = spiciness * 100
elif spiciness <= 70:
    water = spiciness * 500
else:
    water = spiciness * 3000
print(water)

https://bell-sw.com/pages/downloads/#jdk-17-lts

a =int(input())
if (a < 10):
    c = 0
elif (a > 9 and a < 31):
    c = (a * 100)
elif (a > 30 and a < 71):
    c = (a * 500)
else:
    c = (a * 3000)
print(c)