import java.io.BufferedReader;
import java.io.InputStreamReader;

public class Main {
	public static void main(String[] args) throws Exception {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		String[] sa = br.readLine().split(" ");
		int n = Integer.parseInt(sa[0]);
		int d = Integer.parseInt(sa[1]);
		int k = Integer.parseInt(sa[2]) - n;
		br.close();

		int mod = 1000000007;
		long[][] dp = new long[n + 1][k + 1];
		dp[0][0] = 1;
		for (int i = 0; i < n; i++) {
			for (int j = 1; j <= k; j++) {
				dp[i][j] += dp[i][j - 1];
			}
			for (int j = 0; j <= k; j++) {
				dp[i + 1][j] += dp[i][j];
				if (j >= d) {
					dp[i + 1][j] -= dp[i][j - d];
				}
				dp[i + 1][j] %= mod;
			}
		}
		System.out.println(dp[n][k]);
	}
}