View Code of Problem 3696

#include<stdio.h>
void main(){
  int n;
  while(scanf("%d",&n)!=EOF){
    int res=n%10;
    for(int i=0;i<n-1;i++){
      if(res=0) break;
      res=res*(n%10);
      res=res%10;
    }
    if(res=0)
      printf("1\n");
    else
      printf("%d\n",res%10);
  }
}