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#include <iostream>
#include <fstream>
using namespace std;
ifstream fi("rucsac.in");
ofstream fo("rucsac.out");
long long v[1001][1001]={0};
int main()
{
int n,g,d[1000]={0},val[1000]={0},smx,m[5][10001]={0};
fi>>n>>g;
for(int i=1;i<=n;i++){
fi>>d[i]>>val[i];
}
for(int i=1;i<=n;i++){
for(int j=1;j<=g;j++){
if(j>=d[i]){
if((m[1][j-d[i]]+val[i])>m[1][j])
m[2][j]=m[1][j-d[i]]+val[i];
else if((m[1][j-d[i]]+val[i])<m[1][j])
m[2][j]=m[1][j];
else
m[2][j]=m[1][j];
}
}
for(int j=1;j<=g;j++)m[1][j]=m[2][j];
}
fo<<m[2][g];
}