import sys
import pypyjit
import itertools
import heapq
import math
from collections import deque, defaultdict
import bisect

input = sys.stdin.readline
sys.setrecursionlimit(10 ** 6)
pypyjit.set_param('max_unroll_recursion=-1')


def index_lt(a, x):
    'return largest index s.t. A[i] < x or -1 if it does not exist'
    return bisect.bisect_left(a, x) - 1


def index_le(a, x):
    'return largest index s.t. A[i] <= x or -1 if it does not exist'
    return bisect.bisect_right(a, x) - 1


def index_gt(a, x):
    'return smallest index s.t. A[i] > x or len(a) if it does not exist'
    return bisect.bisect_right(a, x)


def index_ge(a, x):
    'return smallest index s.t. A[i] >= x or len(a) if it does not exist'
    return bisect.bisect_left(a, x)


N, d, K = map(int, input().split())
mod = 10 ** 9 + 7

dp = [[0 for _ in range(K + 1)] for _ in range(N + 1)]
dp[0][0] = 1
for i in range(N):
    for j in range(K):
        for k in range(1, d + 1):
            if j + k > K:
                break
            dp[i + 1][j + k] += dp[i][j]
            dp[i + 1][j + k] %= mod
print(dp[N][K])