#include<bits/stdc++.h>
#define REP(i,b,e) for(int i=b;i<e;i++)
using ll = int_fast64_t;
const int MOD = 1e9+7;

int main(){
    int n, k;
    scanf("%d %d", &n, &k);
    int a[n];
    REP(i, 0, n){
        scanf("%d", &a[i]);
        a[i] -= k;
    }

    ll dp[1+n][20200] = {};
    dp[0][10100] = 1;
    REP(i, 1, 1+n){
        REP(j, 0, 20200){
            dp[i][j] += dp[i-1][j];
            dp[i][j] %= MOD;
            if(j<a[i-1] or 20200<=j-a[i-1]) continue;
            dp[i][j] += dp[i-1][j-a[i-1]];
            dp[i][j] %= MOD;
        }
    }

    ll ans = 0;
    REP(i, 10100, 20200){
        ans += dp[n][i];
        ans %= MOD;
    }

    printf("%ld\n", (ans-1+MOD)%MOD);
    return 0;
}