#include <algorithm>
#include <cstdio>
#include <iostream>
#include <cmath>

unsigned int cur = 0;

unsigned int nextRand24(int a, int b) {
    cur = cur * a + b;
    return cur >> 8;
}

unsigned int nextRand32(int a1, int b1) {
    unsigned int a = nextRand24(a1, b1), b = nextRand24(a1, b1);
    return (a << 8) ^ b;
}

int cmp(const void *x1, const void *x2) {
    long long res = (*(long long *) x1 - *(long long *) x2);
    res = res % INTMAX_MAX;
    return (int) res;
}

long long gcd(long long a, long long b) {
    long long c;
    while (b != 0) {
        c = a % b;
        a = b;
        b = c;
    }
    return (abs(a));
}

int main() {
    long long sum = 0;
    int n, a, b;
    std::cin >> n >> a >> b;
    long long x[n];
    for (int i = 0; i < n; i++) {
        x[i] = nextRand32(a, b);
    }

    for (int i = 0; i < n; i++) {
        sum += x[i];
    }
    long long g = (gcd(sum, n));
    sum = sum / g;
    n = n / g;
    std::cout << sum << "/" << n;
    return 0;
}