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#include <fstream>
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int n, G;
int W[5008], P[10008];
int d[2][10008];
void init(){
fin>>n>>G;
int i;
for(i=1;i<=n;i++)fin>>W[i]>>P[i];
}
void pd(){
int ant, crt;
ant = 1; crt = 0;
int i, g;
for(i=1;i<=n;i++){
for(g=0;g<=G;g++){
d[crt][g]=d[ant][g];
if(d[crt][g]<=d[ant][g-W[i]]+P[i]&&W[i]<=g)
d[crt][g]= d[ant][g-W[i]]+P[i];
}
ant=1-ant;crt=1-crt;
}
}
int main(){
init();
pd();
fout<<d[1][G]<<'\n';
return 0;
}