#include <stdint.h>
#include <algorithm>
#include <bitset>
#include <functional>
#include <iostream>
#include <string>
#include <vector>

constexpr int64_t kMod = 1'000'000'000LL + 7;

int64_t memo[100 + 1][20000 + 1];

int64_t N, K;
int64_t solve(int64_t i, int64_t S) {
  if(memo[i][S]) {
    if(memo[i][S] == -1) return 0;
    return memo[i][S];
  }
  if(S < 0) {
    memo[i][S] = -1;
    return 0;
  }
  if(i == N) {
    if(S % N == 0) {
      return 1;
    }
    return 0;
  }
  int64_t t = 0;
  for(int v = 0; (v + K) * i <= S; v++){
    t = (t + solve(i + 1, S - (v + K) * i)) % kMod;
  }
  if(t == 0) {
    memo[i][S] = -1;
  } else {
    memo[i][S] = t;
  }
  return t;
}

int main(int argc, char *argv[]) {
  int64_t S;
  std::cin >> N >> S >> K;

  std::cout << solve(1, S) << std::endl;

  return 0;
}