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

if(A > 0):
    ans = 0
    for i in range(-2*10**6,2*10**6):
        if(A*i*i + B*i + C < 0):ans += 1
    print(ans)
else:
    ans = 0
    for i in range(-2*10**6,2*10**6):
        if(A*i*i + B*i + C > 0):ans += 1
    print(ans)