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#include <bits/stdc++.h>
using namespace std;
ifstream f("rucsac.in");
ofstream g("rucsac.out");
int w[5010], p[5010], d[5010][10010], n, gr;
void dostuff(){
f>>n>>gr;
for (int i=1; i<=n; i++){
f>>w[i]>>p[i];
}
}
void dinamica(){
int i, cw;
for (i=1; i<=n; i++){
for (cw=0; cw<=gr; cw++){
d[i][cw]=d[i-1][cw];
if (w[i]<=cw){
d[i][cw]=max(d[i][cw], d[i-1][cw-w[i]]+p[i]);
}
}
}
}
int main()
{
ios_base::sync_with_stdio(false);
dostuff();
dinamica();
g<<d[n][gr];
return 0;
}