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#include<fstream>
#include<algorithm>
using namespace std;
ifstream f("rucsac.in");
ofstream g("rucsac.out");
int main(){
short int m[5005],p[5005],n,h,i,j,t=0;
int a[2][10005]={};
f>>n>>h;
for(i=1; i<=n; ++i){
f>>m[i]>>p[i];
}
for(i=1; i<=n; ++i){
for(j=1; j<=h; ++j){
if((j-m[i])>=0){
a[t][j]=max(a[1-t][j], a[1-t][j-m[i]]+p[i]);
}
else{
a[t][j]=a[1-t][j];
}
}
t=1-t;
}
g<<max(a[t][h],a[1-t][h]);
f.close();
g.close();
return 0;
}