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1. 刘谦 #1 · 2022-10-15

   include <bits/stdc++.h>

   using namespace std;

   int main() {

   int r, i = 0, a = 0;
   string n;
   cin >> r >> n;
   while (n.size() != i) {
   	a = a * r;
   	a += n[i] - '0';
   	i++;
   }
   cout << a << endl;
   return 0;
   

   }