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#include <iostream>
#include <fstream>
#include <cmath>
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int dp[2004][10005], w[5005],p[5005];
int main()
{
int n, Gmax;
fin>>n>>Gmax;
for(int i=1;i<=n;i++){
fin>>w[i]>>p[i];
}
for(int i=1;i<=n;i++){
int lin_cur=i%2;
int lin_ant=1-lin_cur;
for(int j=0; j<=Gmax; j++)
if(j>=w[i])
dp[lin_cur][j]=max( dp[lin_ant][j], dp[lin_ant][j-w[i]] + p[i] );
else
dp[lin_cur][j]= dp[lin_ant][j];
}
// fout<<dp[n%2][Gmax];
int maxi=-1;
for(int i=1;i<=Gmax;i++){
maxi=max(maxi,dp[n%2][i]);
}
fout<<maxi;
return 0;
}