#include <stdio.h>
#include <stdlib.h>
#define in "pairs.in"
#define out "pairs.out"
int n, v[100001], nr;
int cmmdc(a,b){
    int r;
    while(b!=0){
        r=a%b;
        a=b;
        b=r;
    }
    return a;
}
int main()
{

    freopen(in, "r", stdin);
    freopen(out, "w", stdout);
    scanf("%d",&n);
    int i, j;
    for (i = 1; i <= n; i++){
        scanf("%d",&v[i]);
        for(j=1; j < i; j ++)
            if(cmmdc(v[i],v[j])==1)
                nr++;
    }
    printf("%d",nr);


    return 0;
}