def main():
    ans = 0
    a, d, c = list(map(int, input().split()))
    X = [0] * c
    a, b = 1, a+1
    t = 0
    while a < b:
        if not a % c and a+c <= b:
            t += 1
            a += c
        else:
            X[a%c] += 1
            a += 1
    for i in range(1, c):
        ans = (ans + (t+X[i])*pow(i, d, c)) % c
    return ans

print(main())