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#include<iostream>
#include<string>
using namespace std;
int main(){
string s;
while(cin >> s){
int sum = 0, w = 1;
for(int i = s.size() - 1; i >= 2; i--){
int num;
if(s[i] >= '0' && s[i] <= '9') num = s[i] - '0';
else num = s[i] - 'A' + 10;
sum += num * w;
w *= 16;
}
cout << sum << endl;
}
return 0;
}
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