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#include <fstream>
#include <iostream>
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int n,m,i,j;
int p[5002];
int g[5002];
int dp[5002][100002];
int main()
{
fin>>n>>m;
for(i=1; i<=n; i++)
fin>>g[i]>>p[i];
for(i=1; i<=n; i++)
for(j=1; j<=m; j++)
{
dp[i][j]=dp[i-1][j];
if(j>=g[i])
dp[i][j]=max(dp[i][j],dp[i-1][j-g[i]]+p[i]);
}
fout<<dp[n][m]<<'\n';
return 0;
}