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#include <fstream>
#include <climits>
using namespace std;
long long sol[1010];
long long g[1010];
long long v[1010];
long long i,j,n,G,Max;
int main() {
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
fin>>n>>G;
for (i=1;i<=n;i++) {
fin>>g[i]>>v[i];
}
for (i=1;i<=G;i++) {
sol[i]=-1;
}
for (i=1;i<=n;i++) {
for (j=G;j>=0;j--) {
if (sol[j]!=-1) {
if (j+g[i]<=G) {
sol[j+g[i]]=sol[j]+v[i];
}
}
}
}
Max=LLONG_MIN;
for (i=1;i<=G;i++) {
Max=max(Max,sol[i]);
}
fout<<Max;
return 0;
}