def main():
    from math import sqrt,sin,cos,tan,ceil,radians,floor,gcd,exp,log,log10,log2,factorial,fsum
    from heapq import heapify, heappop, heappush
    from bisect import bisect_left, bisect_right
    from copy import deepcopy
    import copy
    import random
    from collections import deque,Counter,defaultdict
    from itertools import permutations,combinations
    from decimal import Decimal,ROUND_HALF_UP
    #tmp = Decimal(mid).quantize(Decimal('0'), rounding=ROUND_HALF_UP)
    from functools import lru_cache, reduce
    #@lru_cache(maxsize=None)
    from operator import add,sub,mul,xor,and_,or_,itemgetter
    INF = 10**18
    mod1 = 10**9+7
    mod2 = 998244353
    
    #DecimalならPython
    #再帰ならPython!!!!!!!!!!!!!!!!!!!!!!!!!!
    
    '''
    dp
    O(N^2*D^2)
    もう一つ高速化がいる
    累積和?
    '''
    
    N,D,K = map(int, input().split())
    
    dp = [[0]*(K+1) for _ in range(N+1)]
    dp[0][0] = 1
    
    for i in range(1,N+1):
        for j in range(K):
            dp[i][j+1] += dp[i-1][j]
            if j+D+1 <= K:
                dp[i][j+D+1] -= dp[i-1][j]
        
        for j in range(1,K+1):
            dp[i][j] += dp[i][j-1]
            dp[i][j] %= mod1
    
    print(dp[N][K])
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
if __name__ == '__main__':
    main()