Sum of 1^1+2^2+3^3+....+n^n using C language

#include<stdio.h>
int main()
{
 int i,j,n,multi,sum=0;
 printf("enter the value of n :");
 scanf("%d",&n);
 for(i=1;i<=n;i++)
 {
  multi=1;
  for(j=1;j<=i;j++)
  {
   multi=multi*i;
  }
  sum=sum+multi;
 }
 printf("sum=%d",sum);
 return 0;
}