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#include<bits/stdc++.h>
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using namespace std;
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int main() {
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string s;
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int i=0,count,sum;
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while(getline(cin,s)) {
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int count=s.length();
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sum=0;
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for(i=count-1; i>=0; i--) { //<2F><>ʮ<EFBFBD><CAAE><EFBFBD><EFBFBD><EFBFBD>Ƹ<EFBFBD>λ<EFBFBD><CEBB>ʼ<EFBFBD><CABC>ÿλ<C3BF><CEBB>ת<EFBFBD><D7AA><EFBFBD><EFBFBD>ʮ<EFBFBD><CAAE><EFBFBD><EFBFBD>
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if(s[i]>='0'&&s[i]<='9') { //<2F><><EFBFBD><EFBFBD><EFBFBD>ַ<EFBFBD><D6B7><EFBFBD>ת<EFBFBD><D7AA>
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sum+=(s[i]-48)*pow(16,count-i-1);
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} else if(s[i]>='A'&&s[i]<='F') { //<2F><>ĸ<EFBFBD>ַ<EFBFBD><D6B7><EFBFBD>ת<EFBFBD><D7AA>
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sum+=(s[i]-55)*pow(16,count-i-1);
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}
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}
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cout<<sum;
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}
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}
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