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#include <fstream>
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int N, G;
int w[5005], p[5005];
int m[10005][2];
bool s = 1;
int main(){
fin >> N >> G;
for(int i = 1; i <= N; i++){
fin >> w[i] >> p[i];
}
for(int i = 1; i <= N; i++){
for(int wi = 1; wi <= G; wi++){
if(w[i] > wi){
m[wi][s] = m[wi][1-s];
}else{
m[wi][s] = max(m[wi][1-s], m[wi-w[i]][1-s] + p[i]);
}
}
s = 1-s;
}
fout << m[G][1-s];
return 0;
}