hdu 1.2.8

#include<cstdio>
#include<iostream>
using namespace std;

int pow(int a,int b)
{
    int ans = 1;
    while(b--)
    {
        ans *= a;
    }
    return ans;

}
int main()
{
    //freopen("input.txt","r",stdin);
    int T;
    int a,b,num,k;
    char opl,opr;
    while(cin>>T)
    {
        num = 0;

        while(T--)
        {
            cin>>a>>opl>>b>>opr;
            k = 0;
            while(a)
            {
                num += a%10*pow(b,k++);
                a /= 10;
            }

        }
        cout<<num<<endl;
    }
    return 0;
}