#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
using ll=long long;
using ld=long double;
ld pie=3.141592653589793;
ll inf=1555505555;
ll mod=1000000007;
int main(){
    ll n,l;
    cin >> n >> l;
    vector<ll>s(n),a(n);
    for (ll i = 0; i < n; i++)
    {
        cin >> s[i] >> a[i];
    }
    vector<vector<ll>>dp(n+1,vector<ll>(l+1,-1));
    dp[0][0]=0;
    for (ll i = 0; i < n; i++)
    {
        for (ll j = 0; j <=l; j++)
        {
            if (dp[i][j]==-1)
            {
                continue;
            }
            dp[i+1][j]=max(dp[i+1][j],dp[i][j]);
            if (j+s[i]>l)
            {
                continue;
            }
            dp[i+1][j+s[i]]=max(dp[i+1][j+s[i]],dp[i][j]+a[i]);
        }
    }
    ll ans=0;
    for (ll i = 0; i <=l; i++)
    {
        ans=max(ans,dp[n][i]);
    }
    cout << ans << endl;
}