#include <fstream>
using namespace std;
fstream f("kcifra.in");
ofstream g("kcifra.out");
int main()
{
int k;
f>>k;
int c,nrcif=0,nr;
if(k<=18)c=(k+1)/2; //x_
else
if(k<=288)
{ ///xy_
nr=9; nrcif=18;
while(nrcif+3<=k)
{
nrcif+=3;nr++;
}
if (nrcif==k)
c=nr%10;
else
{
nr++;
if(nrcif+1==k)
c=nr/10;
else
c=nr%10;
}
}
else
if(k<=3888)
{ ///xyz_
nr=99; nrcif=288;
while(nrcif+4<=k)
{
nrcif+=4; nr++;
}
if (nrcif==k)
c=nr%10;
else
{
if(nrcif+1==k)
c=nr/100;
else
c=nr/10%10;
}
}
else
if(k<=48888)
{ ///xyzt_
nr=999; nrcif=3888;
while(nrcif+5<=k)
{nrcif+=5;nr++;}
if (nrcif==k)
c=nr%10;
else
{
if(nrcif+1==k)c=nr/1000;
else
if(nrcif+2==k)c=nr/100%10;
else
if(nrcif+3==k)c=nr/10%10;
else
c=nr/10%10;
}
}
else
{ ///xyztu_
nr=9999; nrcif=48888;
while(nrcif+6<=k)
{ nrcif+=6;nr++;}
if (nrcif==k)c=nr%10;
else
{
if(nrcif+1==k)c=nr/10000;
else
if(nrcif+2==k)c=nr/1000%10;
else
if(nrcif+3==k)c=nr/100%10;
else
if(nrcif+4==k)c=nr/10%10;
else
c=nr/10%10;
}
}
g<<c<<endl;
return 0;
}
