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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[2][10001];
f>>n>>g;
for(int i=1;i<=n;i++)
f>>w[i]>>p[i];
for(int i=1;i<=n;i++){
for(int j=0;j<=g;j++){
c[1][j]=c[0][j];
if(w[i]<=j) c[1][j]=max(c[1][j],c[0][j-w[i]]+p[i]);}
for(int k=0;k<=g;k++)
c[0][k]=c[1][k];
}
h<<c[n][g];
return 0;
}