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#include <iostream>
#include <vector>
#include <algorithm>
#include <fstream>
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
struct taska {
int suly, ertek;
};
int dp[5010][10010];
int main() {
int n, g;
fin >> n >> g;
vector<taska> v(n+1);
for(int i=1; i<=n; i++) {
fin >> v[i].suly >> v[i].ertek;
}
for(int i=1; i<=n; i++) {
for(int j=g; j>=1; j--) {
dp[i][j]=dp[i-1][j];
}
for(int j=1; j<=g; j++) {
if(dp[i-1][j]!=0) {
if(j+v[i].suly<=g) {
dp[i][j+v[i].suly]=max(dp[i][j+v[i].suly], dp[i-1][j]+v[i].ertek);
}
}
if(dp[i][v[i].suly]<v[i].ertek) {
dp[i][v[i].suly]=v[i].ertek;
}
}
}
int maxi=-1;
for(int j=1; j<=g; j++) {
maxi=max(maxi, dp[n][j]);
}
fout << maxi;
return 0;
}