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#include <iostream>
#include <fstream>
using namespace std;
ifstream f("rucsac.in");
ofstream g("rucsac.out");
int n, G, p[5005], gr[5005], DP[5005][10000];
int main()
{
f>>n>>G;
for(int i = 1; i <= n; i++)
f>>gr[i]>>p[i];
for(int i = 1; i <= n; i++)
{
for(int j = 1; j <= G; j++)
{
DP[1][j] = DP[0][j];
if(gr[i] <= j)
{
DP[1][j] = max(DP[1][j],DP[0][j-gr[i]]+p[i]);
//cout<<DP[i][j]<<' '<<DP[i-1][j-gr[i]]+p[i]<<' '<<i<< ' '<<j<< '\n';
}
}
for(int j = 1; j <= G; j++) DP[0][j] = DP[1][j];
}
/*for(int i = 1; i <= n; i++)
{
for(int j = 1; j <= G; j++)
{
cout<<DP[i][j]<< ' ';
}
cout<<'\n';
}*/
g<<DP[1][G]<<'\n';
return 0;
}