import java.io.*; import java.util.*; import java.util.stream.*; public class Main { static final int MOD = 998244353; public static void main(String[] args) throws Exception { Scanner sc = new Scanner(); long h = sc.nextInt(); long w = sc.nextInt(); long k = h * w - sc.nextLong(); long ans = 0; for (int i = 0; i <= h && i * w <= k; i++) { if ((k - i * w) % (h - i) == 0 && (k - i * w) / (h - i) <= w) { ans += getComb(h, i) * getComb(w, (k - i * w) / (h - i)) % MOD; ans %= MOD; } } System.out.println(ans); } static long getComb(long a, long b) { return fact(a) * pow(fact(a - b) * fact(b) % MOD, MOD - 2) % MOD; } static long fact(long a) { long ans = 1; for (int i = 2; i <= a; i++) { ans *= i; ans %= MOD; } return ans; } static long pow(long x, long p) { if (p == 0) { return 1; } else if (p % 2 == 0) { return pow(x * x % MOD, p / 2); } else { return pow(x, p - 1) * x % MOD; } } } class Utilities { static String arrayToLineString(Object[] arr) { return Arrays.stream(arr).map(x -> x.toString()).collect(Collectors.joining("\n")); } static String arrayToLineString(int[] arr) { return String.join("\n", Arrays.stream(arr).mapToObj(String::valueOf).toArray(String[]::new)); } } class Scanner { BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); StringTokenizer st = new StringTokenizer(""); StringBuilder sb = new StringBuilder(); public Scanner() throws Exception { } public int nextInt() throws Exception { return Integer.parseInt(next()); } public long nextLong() throws Exception { return Long.parseLong(next()); } public double nextDouble() throws Exception { return Double.parseDouble(next()); } public int[] nextIntArray() throws Exception { return Stream.of(br.readLine().split(" ")).mapToInt(Integer::parseInt).toArray(); } public String next() throws Exception { while (!st.hasMoreTokens()) { st = new StringTokenizer(br.readLine()); } return st.nextToken(); } }