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#include<bits/stdc++.h>
using namespace std;
int g,w;
int e[1100],c[1100],d[1100][5100];
int main(){
ifstream cin("energii.in");
ofstream cout("energii.out");
cin>>g>>w;
for(int i=1;i<=g;i++){
cin>>e[i]>>c[i];
}
int l=0;
for(int i=1;i<=g;++i,l=1-l)
for(int j=0;j<=w;j++){
d[1-l][j]=d[l][j];
if(e[i]<=j)
d[1-l][j]=max(d[1-l][j],d[l][j-e[i]]+c[i]);
}
cout<<d[l][w];
return 0;
}