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#include <fstream>
#include <algorithm>
using namespace std;
ifstream f("rucsac.in");
ofstream h("rucsac.out");
int main()
{
int n,g,w[5001],p[5001],c[5001][10001];
f>>n>>g;
for(int i=1;i<=n;i++)
f>>w[i]>>p[i];
for(int i=0;i<=g;i++)
c[0][i]=0;
for(int i=0;i<=n;i++)
c[i][0]=0;
for(int i=1;i<=n;i++)
for(int j=1;j<=g;j++)
if(j<w[i])
c[i][j]=c[i-1][j];
else c[i][j]=max(c[i-1][j],c[i-1][j-w[i]]+p[i]);
h<<c[n][g];
return 0;
}