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#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
long long n,gt, g[5010], p[5010], dp[10001][10001], p;
int main()
{
fin>>n>>gt;
for(int i=1; i<=n; i++){
fin>>g[i]>>p[i];
}
for(int i=1; i<=n; i++){
for(int j=0; j<=gt; j++){
dp[i][j]=dp[i-1][j];
if(g[i]<=j)
dp[i][j]=max(dp[i][j], dp[i-1][j-g[i]]+p[i]);
}
}
p=dp[n][gt];
fout<<p;
return 0;
}