H, W, K = map(int, input().split())

MOD = 998244353
H_C_, W_C_ = [1]*(H+1), [1]*(W+1)
for i in range(H):
  H_C_[i+1] = H_C_[i] * (H-i) * pow(i+1, MOD-2, MOD) % MOD
for i in range(W):
  W_C_[i+1] = W_C_[i] * (W-i) * pow(i+1, MOD-2, MOD) % MOD

ans = 0
for i in range(1, H + 1):
  if K % i == 0 and K//i <= W:
    r, c = H - i, W - K//i
    ans += H_C_[r] * W_C_[c]
    ans %= MOD
print(ans)