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#include <bits/stdc++.h>
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
//vector<vector<int>>dp;
vector<vector<long long>> dp;
struct rucsac
{
long long p, g;
};
rucsac v[5001];
void rezolvare(int n,int g)
{
int i, j;
dp[0][0] = 0;
for(i = 1; i <= n; i++)
for(j = 0; j <= g; j++)
{
dp[i][j] = dp[i - 1][j];
if(j >= v[i].g)
dp[i][j] = max(dp[i][j], dp[i - 1][j - v[i].g] + v[i].p);
}
}
int main()
{
int n,g;
fin >> n >> g;
dp.resize(n + 1, vector<long long>(g + 1, 0));
for(int i =1 ; i <= n; i++)
{
fin >> v[i].g >> v[i].p;
}
rezolvare(n, g);
fout << dp[n][g] <<' ';
//for(int i =1 ; i <= n; i++)
// fout << v[i].p <<' ' << v[i].g << '\n';
return 0;
}