n=int(input())
print((1+n)*n//2)

管敏皓爱影 #include <bits/stdc++.h>

using namespace std;

int main() { long long sum = 0, n; cin >> n;

for (int i = 1; i <= n; i++) {
    sum += i;
}

cout << sum;

return 0;

}

我是那维莱特 #include

using namespace std;

int n,s=0; int main() { cin>>n; int i=1; while(i<=n){ s=i+s; i=i+1; } cout<<s<<endl; return 0; }

n=int(input()) print((1+n)*n//2) 管敏皓去玩cs

#include using namespace std; int n, s=0; int main() { cin>>n; int i=1; while(i<=n){ s=s+i; i=i+1; } cout<<s<<endl; return 0; }

有人做下17题吗太麻烦了

#include <iostream>

using namespace std;

int main() {
     int a,b=0,c=0;
      cin>>a;
      while(b<a)
      {
        b=b+1;
        c=c+b;
      }

        cout <<c;
        

return 0;
}

全体目光向我看齐，管敏皓是个XX #include <bits/stdc++.h> using namespace std; int main() { int n,s=0; cin>>n>>s; int i=1; while (i<=n) { s=s+i; i+=1; } cout << s; return 0; }

我是关羽，我爱ymz #include

using namespace std; int n, s=0; int main() { int s=0; cin >>n; int i=1; while (i<=n){ s=s+i; i=i+1; } cout << s << endl; return 0; }