#include <bits/stdc++.h>
#define st first
#define nd second
#define pb push_back
#define mp make_pair
#define ll long long
using namespace std;
ifstream fin( "rucsac.in" );
ofstream fout( "rucsac.out" );
void fast()
{
    cin.tie( 0 );
    ios_base::sync_with_stdio( 0 );
}
int n, g;
int w[5005];
int p[5005];
int dp[2][10005];
int main()
{
    fast();
    fin >> n >> g;

    for( int i = 1; i <= n; i++ )
        fin >> w[i] >> p[i];

    for( int i = 1; i <= n; i++ )
        for( int k = w[i]; k <= g; k++ )
            dp[i % 2][k] = max( dp[( i - 1 ) % 2][k], dp[( i - 1 ) % 2][k - w[i]] + p[i] );

    fout << dp[n%2][g];
    return 0;
}