#include<stdio.h>void main(){ int i,n; int sum=0; scanf("%d",&n); for(i=1;i<=n;i++) sum+=i; printf("%d",sum);} void main(){ int i=0,n; int sum=0; while(i<=n) { i++;sum+=n; }printf("%d",sum);}------------------ int i=0,sum=0; int n;scanf("%d",&n);do{ i++; sum+=i;}while(i<=n);printf("%d",sum);}
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