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#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int matrix[5005][10005];
int g[10005], p[10005];
int length, gMax;
int main() {
fin >> length >> gMax;
for (int iter = 1; iter <= length; ++iter) {
fin >> g[iter] >> p[iter];
}
for (int l = 1; l <= length; ++l) {
for (int c = 1; c <= gMax; ++c) {
matrix[l][c] = matrix[l - 1][c];
if(g[l] <= c)
matrix[l][c] = max(matrix[l - 1][c], matrix[l - 1][c - g[l]] + p[l]);
}
}
// for (int l = 1; l <= length; ++l) {
// for (int c = 1; c <= gMax; ++c) {
// fout<<matrix[l][c]<<'\t';
// }
// fout<<'\n';
// }
fout << matrix[length][gMax];
return 0;
}