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#include <bits/stdc++.h>
using namespace std;
int n,g,G[5010],P[5010],DP[2][5010];
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int main(){
fin>>n>>g;
for(int i=0;i<n;i++){
fin>>G[i]>>P[i];
}
for(int i=0;i<n;i++)DP[0][G[i]]=P[i];
for(int i=1;i<n;i++){
for(int j=0;j<=g;j++){
if(DP[(i-1)%2][j-G[i]])DP[i%2][j]=max(DP[(i-1)%2][j-G[i]]+P[i],DP[i%2][j]);
DP[i%2][j]=max(DP[i%2][j-1],DP[i%2][j]);
}
}
fout<<DP[(n-1)%2][g];
}