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#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int v[10000];
int w[10000];
int m[2][10001];
int main()
{
int n,g,i,j;
fin >> n >> g;
for(i=1;i<=n;++i)
fin >> w[i] >> v[i];
for(j=0;j<=g;++j)
m[0][j] = 0;
int t = 1;
for(i=1;i<=n;++i,t=1-t)
for(j=0;j<=g;++j)
if(j >= w[i])
m[t][j] = max(m[1-t][j-w[i]] + v[i],m[1-t][j]);
else
m[t][j] = m[1-t][j];
fout << m[1-t][g];
return 0;
}