import sys
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())
    poly = [1]

    for i in range(n):
        npoly = [0] * (len(poly) + (d - 1))
        for j in range(len(poly)):
            for k in range(d):
                npoly[j + k] = (npoly[j + k] + poly[j]) % M
        poly = npoly

    return poly[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()