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#include <bits/stdc++.h>
using namespace std;
ifstream fi("rucsac.in");
ofstream fo("rucsac.out");
int ct;
int i,n,g, a[5000][5000];
int c[4000],go[4000];
void cit()
{
fi>>n>>g;
for(i=1;i<=n;i++)
{
fi>>go[i]>>c[i];
}
}
void scri()
{
fo<<a[ct][g];
}
void ex()
{
int u,z=1;
for(int i=1;i<=n ;i++)
{
u=z;
z=1-z;
for(int j=1;j<=g ;j++)
{
if (go[i]>j) a[u][j]=a[z][j];
else
a[u][j]=max(a[z][j],a[z][j-go[i]]+c[i]) ;
}
ct=u;
}
}
int main()
{
cit();
ex();
scri();
return 0;
}