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#include <iostream>
#include <fstream>
using namespace std;
ifstream f("rucsac.in");
ofstream g("rucsac.out");
int opt[10001],w[5001],p[5001],sol,n,G;
int main(){
f>>n>>G;
for(int i=1; i<=n; ++i)
f>>w[i]>>p[i];
opt[0]=0;
sol=0;
for(int i=1; i<=n; ++i){
for(int j=G-w[i]; j>=0; --j){
if(opt[j+w[i]]<opt[j]+p[i]){
opt[j+w[i]]=opt[j]+p[i];
if(opt[j+w[i]]>sol)
sol=opt[j+w[i]];
}
}
}
g<<sol;
}