#include<stdio.h>
int main()
{
  int n;
  int i,j;
  int ans;
  int q;
  scanf("%d",&n);
  while(n>0){
    if(n==2){ans=1;n=0;}        //2            //8
    else if(n==3){ans=7;n=0;}    //3            //7
    else if(n==4){ans=11;n=0;}  //2,2に分ける  //6
    else if(n==5){ans=71;n=0;}  //3,2          //5
    else if(n==6){ans=111;n=0;} //2,2,2        //3
    else if(n==7){ans=74;n=0;}  //3,4          //4
    else if(n==8){ans=1111;n=0;}//2,2,2,2      //1
    else if(n==9){ans=777;n=0;} //3,3,3        //2
    else{
        q = n/8;//1111がqこ作れる
        n = n%8;
      }
  }
    //答えはans 1111がqこ
  printf("%d",ans);
  for(i=0;i<q;i++){
    printf("1111");
  }
  printf("\n");
  return 0;
}