from math import gcd
a, b, c = map(int, input().split())
if gcd(a, gcd(b, c)) != 1:
    print("INF")
    exit()
d = {}
for i in range(c):
    for j in range(c):
        x = i*a+j*b
        if x%c not in d:
            d[x%c] = x
        else:
            d[x % c] = min(x, d[x%c])
ans = 0
for i,j in d.items():
    ans += (j-i)//c
print(ans)