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#include<bits/stdc++.h>
using namespace std;
ifstream in("rucsac.in");
ofstream out("rucsac.out");
int n,g,l,w[5001],p[5001],dp[2][10001];
int main()
{
in>>n>>g;
for(int i=0;i<n;++i)
in>>w[i]>>p[i];
for(int i=1;i<n;++i,l=1-l)
for(int j=0;j<=g;++j)
{
dp[1-l][j]=dp[l][j];
if(w[i]<=j)
dp[1-l][j]=max(dp[1-l][j],dp[l][j - w[i]]+p[i]);
}
out<<dp[n][g];
return 0;
}