import sys
from itertools import accumulate
from typing import List, Tuple


def int1(x: str, /): return int(x) - 1


def input(): return sys.stdin.readline().rstrip('\n')


def dbg(*args, **kwargs):
    print(*(repr(arg) for arg in args), *(f'{k}: {repr(v)}' for k, v in kwargs.items()), sep='; ', file=sys.stderr)


def main():
    M = 10 ** 9 + 7
    n, d, x = map(int, input().split())
    dp = [1]

    for i in range(n):
        *s, = accumulate([0] + dp)
        dp = [(s[min(len(s) - 1, j + 1)] - s[max(0, j + 1 - d)]) % M for j in range(len(dp) + (d - 1))]

    return dp[x - n]


def _start():
    ret = main()

    if ret is not None:
        if isinstance(ret, List) or isinstance(ret, Tuple):
            print(*ret)
        else:
            print(ret)


if __name__ == '__main__':
    _start()