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#include <fstream>
#include <iostream>
#include <cmath>
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int ob[5001][2], i, n, dp[11000][2], j, g;
int main()
{
fin>>n>>g;
for (i=1;i<=n;i++)
fin>>ob[i][0]>>ob[i][1];
for (j=1;j<=n;j++)
for (i=1;i<=g;i++)
{
dp[i][0]=dp[i][1];
if (i>=ob[j][0])
dp[i][1]=max(dp[i][1], dp[i-ob[j][0]][0]+ob[j][1]);
}
fout<<dp[g][1];
return 0;
}