#include <iostream> using namespace std; int main() { long long n,sum1=0,sum2=0; cin>>n; int i; for(i=1;i<=n;i++) {if(i%2==0){ sum2+=i;} else{sum1+==i;} } cout<<"偶数和"<<sum2<<",奇数和"<<sum1<<endl; return 0; }