#include <stdio.h>

int cmmdc(int a, int b) {
    int r;
    while (b != 0) {
        r = a % b;
        a = b;
        b = r;
    }
    return a;
}

int main() {
    int N, i, j, count;
    FILE* in = fopen("fractii.in", "r");
    FILE* out = fopen("fractii.out", "w");
    fscanf(in, "%d", &N);
    
    count = N;
    for (i = 2; i <= N; i++) {
        for (j = 1; j <= N; j++) {
            if (cmmdc(i, j) == 1) {
                count++;
            }
        }
    }

    fprintf(out, "%d", count);

    return 0;
}