import os
#数据已改 (-170,-1000),(0,700),(40,940), (300, 2500),(550,7500)

def calnum (x1, y1, x2, y2, t):
    return int( ((y2-y1)/(x2-x1)) * (t - x1) + y1 )

t =100
x1 , x2 = 0, 0
y1 , y2 = 0, 0
    
while (True):
    t = int( input())
    if t < -400:
        print("-400")
    if t > 1000:
        print("1000")
    if t < -170:
        x1 = -170
        y1 = -1000
        x2 = 0
        y2 = 700
        print(calnum(x1, y1, x2, y2, t))
    elif t < 0:
        x1 = -170
        y1 = -1000
        x2 = 0
        y2 = 700
        print(calnum(x1, y1, x2, y2, t))
    elif t < 40:
        x1 = 0
        y1 = 700
        x2 = 40
        y2 = 940
        print(calnum(x1, y1, x2, y2, t))
    elif t < 300:
        x1 = 40
        y1 = 940
        x2 = 300
        y2 = 2500
        print(calnum(x1, y1, x2, y2, t))
    elif t < 550:
        x1 = 300
        y1 = 2500
        x2 = 550
        y2 = 7500
        print(calnum(x1, y1, x2, y2, t))
    else:
        x1 = 300
        y1 = 2500
        x2 = 550
        y2 = 7500
        print(calnum(x1, y1, x2, y2, t))