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

alpha = (-Decimal(B) - Decimal(B*B - 4*A*C)**Decimal(1/2)) / Decimal(2*A)
beta = (-Decimal(B) + Decimal(B*B - 4*A*C)**Decimal(1/2)) / Decimal(2*A)
if(alpha > beta):alpha,beta = beta,alpha

left = alpha//1 + 1 if alpha//1 == alpha else alpha//1
right = beta//1 - 1 if beta//1 == beta else beta//1
print(max(right - left + 1, 0))