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#include <fstream>
using namespace std;
ifstream in("rucsac.in");
ofstream out("rucsac.out");
int p[1005],v[1005],g[1005];
int main()
{
int n,gmax,a,b=0,j,c,i,max=0;
in>>n>>gmax;
for(i=1; i<=n; i++)
{
in>>g[i]>>v[i];
p[i]=v[i]/g[i];
}
for(i=1; i<=n-1; i++)
{
for(j=1; j<=n; j++)
{
if(max<p[j])
{
max=p[j];
a=j;
}
}
p[a]=-1;
if(gmax-g[a]>=0)
{
gmax=gmax-g[a];
b=b+v[a];
}
else
{
c=g[a]/gmax;
gmax=gmax-g[a]/c;
b=b+v[a]/c;
}
max=0;
}
out<<b;
return 0;
}