// ²òÅú4.5 frac1.c
#include <stdio.h>
#include <stdlib.h>

typedef struct fraction {
    int num;
    int dom;
} Fraction;

int  gcd(int,int);
void set_fraction(int, int, Fraction *);
void add_fraction(const Fraction *,const Fraction *, Fraction *);
void print_fraction(const Fraction *);
void copy_fraction(const Fraction *, Fraction *);

int gcd(int p, int q) {
    while (q>0) {
        int r = p%q;
        p = q; q = r;
    }
    return p;
}

void set_fraction(int x, int y, Fraction *f) {
    int d = gcd(x,y);
    f->num = x/d; f->dom = y/d;
}

void print_fraction(const Fraction *f) {
    printf("%12d/%12d", f->num, f->dom);
}

void add_fraction(const Fraction *a,const Fraction *b, Fraction *c) {
    int d = gcd(a->dom, b->dom);
    int x = a->num * b->dom/d + b->num * a->dom/d;
    int y = a->dom * b->dom/d;
    set_fraction(x, y, c);
}

void copy_fraction(const Fraction *a, Fraction *b) {
    b->num = a->num; b->dom = a->dom;
}

Fraction fx, fy, fz;

void test_fraction() {
    set_fraction(3, 42, &fx); 
    set_fraction(22, 35, &fy);
    add_fraction(&fx, &fy, &fz);

    print_fraction(&fx); printf(" + ");
    print_fraction(&fy); printf(" = ");
    print_fraction(&fz); printf("\n");
}

int main() {
    int n;
    scanf("%d", &n);
    set_fraction(0,1,&fx);
    for (int i=1;i<=n;i++) {
        set_fraction(1, i*i, &fy);
        add_fraction(&fx,&fy,&fz);
        copy_fraction(&fz,&fx);
        printf("%3d:",i); print_fraction(&fx);
        printf("=%10.8f\n", (double)fx.num/fx.dom );
    }
    return 0;
}