const MOD: usize = 1e9 as usize + 7;

fn main() {
    let mut ndk = String::new();
    std::io::stdin().read_line(&mut ndk).ok();
    let ndk: Vec<usize> = ndk.trim().split_whitespace().map(|s| s.parse().unwrap()).collect();
    let n = ndk[0];
    let d = ndk[1];
    let k = ndk[2];

    let mut dp = vec![0usize];
    dp[0] = 1;
    for i in 0..n {
        let start = i+1;
        let end = (i+1) * d;
        let mut next_dp = vec![0usize; end-start+1];
        for j in 0..dp.len() {
            next_dp[j] += dp[j];
            next_dp[j] %= MOD;
            if next_dp.len() > j+d {
                next_dp[j+d] += MOD - dp[j];
                next_dp[j+d] %= MOD;
            }
        }
        for j in 1..next_dp.len() {
            next_dp[j] += next_dp[j-1];
            next_dp[j] %= MOD;
        }
        dp = next_dp;
    }
    println!("{}", dp[k-n]);
}