#include <iostream>
#include <cmath>

bool isEqual(double a, double b){
    return (std::fabs(a-b)<0.0001);
}

bool areEqual(double a, double b, double c){
    return (isEqual(a, b) && isEqual(b, c) && isEqual(c, a));
}

int main() {
    std::ios::sync_with_stdio(false);
    std::cin.tie(0);
    
    double time = 0;
    double t1, t2, t3;
    std::cin >> t1 >> t2 >> t3;
    while(true){
        time += 1.0/6.0;
        double pos1x = std::cos(2*M_PI*time/t1);
        double pos2x = std::cos(2*M_PI*time/t2);
        double pos3x = std::cos(2*M_PI*time/t3);
        if(!areEqual(pos1x, pos2x, pos3x)) continue;
        double pos1y = std::sin(2*M_PI*time/t1);
        double pos2y = std::sin(2*M_PI*time/t2);
        double pos3y = std::sin(2*M_PI*time/t3);
        if(areEqual(pos1y, pos2y, pos3y)) break;
    }
    if(isEqual(time, std::round(time))){
        std::cout << time << "/1\n";
    }else if(isEqual(time*2, std::round(time*2))){
        std::cout << time*2 << "/2\n";
    }else{
        std::cout << time*3 << "/3\n";
    }
    return 0;
}