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#include <iostream>
#include <cstdio>
#define N 5005
using namespace std;
struct obiect
{
int c, g;
}ob[N];
int n, gmax, d[N];
void citire()
{
scanf("%d %d\n", &n, &gmax);
for(int i=1;i<=n;i++)
scanf("%d %d\n", &ob[i].g, &ob[i].c);
}
void generare()
{
int maxim=0;
for(int i=1;i<=n;i++)
for(int j=gmax-ob[i].g;j>=0;j--)
if(d[j+ob[i].g]<d[j]+ob[i].c)
{
d[j+ob[i].g]=d[j]+ob[i].c;
if(d[j+ob[i].g]>maxim)
maxim=d[j+ob[i].g];
}
printf("%d", maxim);
}
int main()
{
freopen("rucsac.in", "r", stdin);
freopen("rucsac.out", "w", stdout);
citire();
generare();
return 0;
}