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#include <fstream>
#include <algorithm>
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
struct obiect{
int p;
int w;
}v[5005];
int dp[2][10005];
int main()
{
int n, g;
fin>>n>>g;
for(int i=1; i<=n; i++)
fin>>v[i].w>>v[i].p;
for(int i=1; i<=n; i++)
for(int j=1; j<=g; j++){
int lin_cur=i%2;
int lin_ant=(i-1)%2;
if(j-v[i].w<0)
dp[lin_cur][j]=dp[lin_ant][j];
else
dp[lin_cur][j]=max(dp[lin_ant][j-v[i].w]+v[i].p, dp[lin_ant][j]);
}
fout<<dp[n%2][g];
return 0;
}