#include
#include
using namespace std;
int sqrt(int n)
{
int s=0;
int e=n;
float ans=-1;
while(s<=e)
{
int m=(s+6)>>1;
if(mm==n)
{
return m;
}
else if(mm<n)
{
ans=m;
s=m+1;
}
else
{
e=m-1;
}
}
return ans;
}
int main()
{
int n;
cin>>n;
cout<<sqrt(n);
return 0;
}
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