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#include<fstream>
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int n,gr,v[5555],g[5555],i,x[5555][11111],j;
int main(){
fin>>n>>gr;
for(i=1;i<=n;i++)
fin>>g[i]>>v[i];
for(i=1;i<=n;i++)
for(j=1;j<=gr;j++)
if(g[i]<=j&&x[i-1][j-g[i]]+v[i]>x[i-1][j])
x[i][j]=x[i-1][j-g[i]]+v[i];
else
x[i][j]=x[i-1][j];
fout<<x[n][gr];
return 0;
}