#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <string.h>
#include <iostream>
#include <sstream>
#include <algorithm>
#include <stack>
#include <vector>
#include <queue>
#include <map>
#include <set>
#include <deque>
#include <functional>
#define _USE_MATH_DEFINES
#include <math.h>
#include <complex>

//#include <atcoder/all>
//using namespace atcoder;

using namespace std;

#define REP(i,n) for(int i = 0; i < (int)n; i++)
#define RREP(i,n) for(int i = (int)n-1; i >= 0; i--)
#define LREP(i,n) for(LL i = 0; i < (LL)n; i++)

#define Vi vector<int>
#define Vl vector<long long>
#define LP pair<long long ,long long>
#define P pair<int, int>
#define T3 tuple<LL, LL, LL>
#define T4 tuple<LL, LL, LL, LL>
#define INF 1000000007
#define SIZE	200010
#define MOD 1000000007
typedef long long LL;

LL inv_mod(LL x) {
	LL y = x, res = 1;
	REP(i, 32) {
		if ((MOD - 2) & ((LL)1 << i)) {
			res = (res * y) % MOD;
		}
		y = (y * y) % MOD;
	}
	return res;
}

LL N, M;
LL F[SIZE], FI[SIZE];
void init() {
	F[0] = FI[0] = 1;
	for (LL i = 1; i < SIZE; i++) {
		F[i] = (F[i - 1] * i) % MOD;
		FI[i] = (FI[i - 1] * inv_mod(i)) % MOD;
	}
}

LL comb(LL n, LL k) {
	LL res = F[n];
	res = (res * FI[n - k]) % MOD;
	res = (res * FI[k]) % MOD;
	return res;
}

int main() {
	init();
	cin >> N >> M;
	
	LL ans = 0;
	for (LL n = N; n <= M; n++) {
		ans = (ans + comb(n, N)) % MOD;
	}
	cout << ans << endl;
}