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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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{
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    int x;
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    cin>>x;
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    if(x>=90) {
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        cout<<"expert";
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    }
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    else if(x>=70){
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        cout<<90-x;
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    }
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    else if(x>=40)
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    {
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        cout<<70-x;
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    }
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    else {
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        cout<<40-x;
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    }
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}