C++

C++
#include<iostream>
#include<string>
using namespace std;</string></iostream>

int toten(string s)
{
int num = 0;
int n = s.size();
for (int i = 2; i < n; i++)
{
int x=1;
for(int j=0;j<n-i-1;j++)
x=x16;
if (s[i] >= '0'&& s[i] <= '9')
num += (s[i]-'0')x;
else if (s[i] >= 'A'&& s[i] <= 'F')
num += (10 + s[i] - 'A')x;
else
num += (10 + s[i]- 'a')x;
}
return num;
}//end func

int main()
{
string s;
while( cin>>s)
{
cout<<toten(s)<<endl;
}

}