24 lines
265 B
C++
24 lines
265 B
C++
#include<iostream>
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using namespace std;
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bool is(int n)
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{
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if(n%7==0) return 0;
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do
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{
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if(n%10==7) return 0;
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n/=10;
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}
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while(n);
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return 1;
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}
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int main()
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{
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int n;
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cin>>n;
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int ans=0;
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for(int i=1;i<=n;i++)
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if(is(i)) ans+=i*i;
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cout<<ans<<endl;
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return 0;
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}
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