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#include <iostream>
#include <fstream>
using namespace std;
ifstream f("rucsac.in");
ofstream g("rucsac.out");
int maxim(int a,int b)
{
if(a>b) return a;
return b;
}
int n,G;
int w[5010],p[5010];
int d[2][10010];
int main()
{
int i,j;
f>>n>>G;
for(i=1; i<=n; ++i)
f>>w[i]>>p[i];
int l=0;
for(i=1; i<=n; ++i, l=1-l)
for(j=0; j<=G; ++j)
{
d[1-l][j]=d[l][j];
if(w[i]<=j)
d[1-l][j]=maxim(d[1-l][j],d[l][j-w[i]]+p[i]);
}
g<<d[l][G];
return 0;
}