#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <math.h>

double calculate_sharpe_ratio(double R, double Rf, double sigma) {
    return (R - Rf) / sigma;
}

int main() {
    double R, Rf, sigma;
    int best_investment = 0;
    double best_sharpe_ratio = -1.0;
    int investment_count = 1;

    while (scanf("%lf %lf %lf", &R, &sigma, &Rf) == 3) {
        int pipefd[2];
        if (pipe(pipefd) == -1) {
            perror("pipe");
            exit(1);
        }

        pid_t pid = fork();
        if (pid == -1) {
            perror("fork");
            exit(1);
        }

        if (pid == 0) { // Child process
            close(pipefd[0]); // Close unused read end
            double sharpe_ratio = calculate_sharpe_ratio(R, Rf, sigma);
            write(pipefd[1], &sharpe_ratio, sizeof(sharpe_ratio));
            close(pipefd[1]);
            exit(0);
        } else { // Parent process
            close(pipefd[1]); // Close unused write end
            double sharpe_ratio;
            read(pipefd[0], &sharpe_ratio, sizeof(sharpe_ratio));
            close(pipefd[0]);

            wait(NULL); // Wait for child to finish

            printf("%.2f\n", sharpe_ratio);

            if (sharpe_ratio > best_sharpe_ratio) {
                best_sharpe_ratio = sharpe_ratio;
                best_investment = investment_count;
            }
            investment_count++;
        }
    }

    printf("Selected Investment: %d\n", best_investment);

    return 0;
}







10 5 1
7 3 1
12 8 2
finish





1.80
2.00
1.25
Selected Investment: 2