#include<stdio.h>
#define rep(i,l,r)for(int i=(l);i<(r);i++)
int main(){
    int n;
    scanf("%d",&n);
    if(n%2){
        printf("7");
        int x=(n-3)/2;
        rep(i,0,x)printf("1");
    }else{
        int x=n/2;
        rep(i,0,x)printf("1");
    }
}