import sys
input = sys.stdin.readline

A,B,C=map(int,input().split())

if A<0:
    A=-A
    B=-B
    C=-C

ANS=[]
for i in range(-10**7,10**7):
    if A*i*i+B*i+C<0:
        ANS.append(i)

print(len(ANS))