import std;

int calc(int n, int d, int k) {
    const MOD = 10^^9 + 7;

    auto dp = new int[][](n + 1, k + 1);
    dp[0][0] = 1;
    for (int i = 1; i <= n; i++) {
        for (int j = 0; j < k; j++) {
            for (int m = 1; m <= d; m++) {
                if (j + m > k) break;

                dp[i][j+m] = (dp[i][j+m] + dp[i-1][j]) % MOD;
            }
        }
    }
    return dp[n][k];
}

void main() {
    int n, d, k; scan(n, d, k);
    writeln(calc(n, d, k));
}

void scan(T...)(ref T a) {
    string[] ss = readln.split;
    foreach (i, t; T) a[i] = ss[i].to!t;
}
T read(T)() { return readln.chomp.to!T; }
T[] reads(T)() { return readln.split.to!(T[]); }
alias readint = read!int;
alias readints = reads!int;