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#include <fstream>
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int main()
{
int p[5001], g[5001], profit[10001], n, k;
fin >> n >> k;
for(int i = 0; i < n; i++){
fin >> g[i] >> p[i];
}
for(int j = 1; j <= k; j++){
profit[j] = -1;
}
profit[0] = 0;
for(int i = 0; i < n; i++){
for(int j = k-g[i]; j >= 0; j--){
if(profit[j] != -1 && profit[j] + p[i] > profit[j + g[i]]){
profit[j + g[i]] = profit[j] + p[i];
}
}
}
fout<<profit[k];
return 0;
}