#include <iostream>
#include <vector>

using namespace std;
using int64 = long long;

const int MOD = 1000000007;

int main() {
    int n,d,k;
    cin >> n >> d >> k;

    vector<vector<int64>> dp(n+1, vector<int64>(k+d+1, 0LL));
    dp[0][0] = 1;

    for (int i=0; i<n; i++) {
        for (int j=i; j<(i+2)*d; j++) {
            if (k - j <= 0) continue;
            dp[i+1][j+1] += dp[i][j];
            dp[i+1][j+1+d] -= dp[i][j];
            dp[i+1][j+1] += dp[i+1][j];
            dp[i+1][j+1] %= MOD;
        }
    }
    if (dp[n][k] < 0) dp[n][k] = (dp[n][k] + MOD) % MOD;
    cout << dp[n][k] << endl;
}


/*
 * 1 0 0 0
 * 0 1 1 0
 * 0 0 1 2 1 0
 * 0 0 0 1 3 3 1 
*/