Help, me! I am English! 撤回

#include<bits/stdc++.h>
using namespace std;
char s[250];
int main () {
	int n, sum = 0;
	cin >> n;
	scanf ( "%s", s );
	int i = 0;
	int len = strlen (s);
	while ( s[i] != '\0' ) {
		sum += ( s[i] - '0' ) * pow ( n, len - i - 1 );
		i++;
	}
	cout << sum;
	return 0;
}