#include <iostream>
#define L long long
using namespace std;
L N,M,P=1e9+7,f[1000005],i,a;
L k(L x,L y){L r=1;for(;y;y/=2,x=x*x%P)if(y%2)r=r*x%P;return r;}
L C(L n,L r){if(r<0||r>n)return 0;return f[n]*k(f[r]*f[n-r]%P,P-2)%P;}
int main(){
    cin>>N>>M;
    for(f[0]=i=1;i<=M;i++)f[i]=f[i-1]*i%P;
    for(L v=-M;v<=M;v++){
        if((M+v)%2==0){
            L d=v%(2*N);if(d<0)d+=2*N;
            if(d==0||d==2*N-1)a=(a+C(M,(M+v)/2))%P;
        }
    }
    cout<<a;
}