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#include <bits/stdc++.h>
using namespace std;
int main()
{
ifstream fin ("rucsac.in");
ofstream fout ("rucsac.out");
int n,g;
fin>>n>>g;
vector<int> dp(g+1);
vector<pair<int,int>> v(n+1);
for(int i=1; i<=n; i++) fin>>v[i].first>>v[i].second;
dp[0] = 0;
for(int i=1; i<=n; i++)
for(int j=g-v[i].first; j>=0; j--)
{
if(dp[j] != -1) dp[j+v[i].first] = max(dp[j+v[i].first],dp[j]+v[i].second);
}
int maxi=-1;
for(int i=0; i<=g; i++)
maxi = max(maxi,dp[i]);
fout<<maxi;
return 0;
}