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#include<iostream>
#include<fstream>
using namespace std;
ifstream f("rucsac.in");
ofstream g("rucsac.out");
int main()
{
int d[5001][5001],i,j,n,G,w[5000],p[5000];
f>>n>>G;
for(i=1; i<=n; i++)
f>>w[i]>>p[i];
for(j=0; j<G; j++)
d[0][j]=INT_MAX;
d[0][0]=0;
for(i=1; i<=n; i++)
for(j=0; j<G; j++)
if(w[i]>j) d[i][j]=d[i-1][j];
else
{
d[i][j]= d[i-1][j];
if(d[i-1][j-w[i]]+p[i] >d[i][j] )
d[i][j]= d[i-1][j-w[i]]+p[i];
}
int maxi=INT_MIN;
for(i=0; i<=G; i++)
if(d[n][i]>maxi)
maxi=d[n][i];
cout<<maxi;
return 0;
}