MOD = 10 ** 9 + 7
INF = 10 ** 10
import sys
input = sys.stdin.readline
sys.setrecursionlimit(100000000)
dy = (-1,0,1,0)
dx = (0,1,0,-1)

def main():
    n,d,k = map(int,input().split())
    dp = [[0] * (k + 1) for _ in range(n + 1)]
    dp[0][0] = 1
    for i in range(n):
        for j in range(1,k + 1):
            dp[i + 1][j] = (dp[i + 1][j - 1] + dp[i][j - 1])%MOD
            if j - d  - 1>= 0:
                dp[i + 1][j] += MOD - dp[i][j - d - 1]
                dp[i + 1][j] %= MOD
    print(dp[-1][-1])

if __name__ =='__main__':
    main()