#region Header
#!/usr/bin/env python3
# from typing import *

import sys
import io
import math
import collections
import decimal
import itertools
from queue import PriorityQueue
import bisect
import heapq

def input():
    return sys.stdin.readline()[:-1]

sys.setrecursionlimit(1000000)
#endregion

# _INPUT = """# paste here...
# """
# sys.stdin = io.StringIO(_INPUT)

MOD = 1000000007

def main():
    N, d, K = map(int, input().split())

    dp = [0 for _ in range(K+1)]
    dp[0] = 1
    for _ in range(N):
        dp1 = [0 for _ in range(K+1)]
        for i in range(K+1):
            dp1[i] = sum(dp[max(i-d, 0):i]) % MOD
        dp = dp1
    print(dp[K])

if __name__ == '__main__':
    main()