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#include <bits/stdc++.h>
#define DIM 10001
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int n, gmax, ans;
int g[DIM], p[DIM], d[DIM*DIM];
int i, j;
int main(){
fin>>n>>gmax;
for(i=1; i<=n; i++)
fin>>g[i]>>p[i];
d[0]=1;
for(i=1; i<=n; i++){
for(j=gmax; j>=0; j--){
if(d[j] && j+g[i]<=gmax){
d[j+g[i]]=max(d[j+g[i]], d[j]+p[i]);
ans=max(ans, d[j+g[i]]);
}
}
}
fout<<ans-1;
}