#include <bits/stdc++.h>
using namespace std;
int main()
{
long long int i,n,j,k;
while(cin>>n)
{
if(n==0)
{
break;
}
k=(log10(n)/log10(2));
cout<<k<<endl;
}
return 0;
}
UVA 11847 Cut The Silver Bar
#include <bits/stdc++.h>
using namespace std;
int main()
{
long long int i,n,j,k;
while(cin>>n)
{
if(n==0)
{
break;
}
k=(log10(n)/log10(2));
cout<<k<<endl;
}
return 0;
}
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