题解 | #与7无关的数#

#include <iostream>
#include <cstdio>

using namespace std;

int main(){
    int n;
    while(scanf("%d",&n)!=EOF){
        int sum=0;
        for(int i=1;i<=n;++i){

            if(i%7!=0&&i%10!=7&&i/10!=7){
                sum+=i*i;
            }
        }
        printf("%d",sum);
    }
}