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#include <bits/stdc++.h>
using namespace std;
ifstream f("rucsac.in");
ofstream g("rucsac.out");
int w[5005], p[5005];
int n, gr;
int d[2][10005];
int main()
{
int i, j;
f >> n >> gr;
for(i = 1; i <= n; i ++) {
f >> w[i] >> p[i];
}
for(i = 1; i <= n; i ++) {
for(j = 1; j <= gr; j ++) {
d[0][j] = d[1][j];
if(w[i] <= j)
d[1][j] = max(d[0][j], d[0][j - w[i]] + p[i]);
}
}
g << d[1][gr] << '\n';
f.close();
g.close();
return 0;
}