from decimal import Decimal
from math import isclose, ceil, floor
A,B,C = list(map(int,input().split()))

alpha = (-Decimal(B) - Decimal(B*B - 4*A*C)**Decimal('0.5')) / Decimal(2*A)
beta  = (-Decimal(B) + Decimal(B*B - 4*A*C)**Decimal('0.5')) / Decimal(2*A)
if(alpha > beta):alpha,beta = beta,alpha

left  = ceil(alpha) + 1 if isclose(ceil(alpha), alpha) else ceil(alpha)
right = floor(beta) - 1 if isclose(floor(beta), beta)  else floor(beta)
print(right - left + 1)