// ²òÅú4.5 frac2.c
#include <stdio.h>
#include <stdlib.h>
#include <inttypes.h>

#define INT uint64_t 	
#define E8  (10000LL*10000) 		/* 1E8 */ 
#define E12 (10000LL*E8)   		/* 1E12 */

#define ROUND

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 copy_fraction(const Fraction *, Fraction *);
void print_fraction(const 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 add_fraction(const Fraction *a,const Fraction *b, Fraction *c) {
    INT num = a->num ;
    INT dom = a->dom ;

#ifdef ROUND 
#define	LIM E12
    while (num > LIM && dom > LIM) 
       { num = (num+5)/10; dom = (dom+5)/10; }
#endif

    INT d = gcd(dom, b->dom);
    INT x = num * b->dom/d + b->num * dom/d;
    INT y = 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;
}

void print_fraction(const Fraction *f) {
//  printf("%12u/%12u", f->num, f->dom);   	// for uint32_t
    printf("%20llu/%20llu", f->num, f->dom); 	// for uint64_t
}

Fraction fx, fy, fz;

int main() {
    int n;
    double r0=0.0, r1;
    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("=%12.10f\n", r1=(double)fx.num/fx.dom );

        if (r0 > r1) { printf("error\n"); return 1; }
        r0 = r1;
    }
    return 0;
}