#include <stdio.h>

int soma(int a, int b);
int fatorial(int num);

int main() {
    int x = 2;
    int y = 3;
    
    int z = soma(x, y);
    
    printf("%d + %d = %d\n", x, y, z);
    printf("%d! = %d\n", z, fatorial(z));

    return 0;
}

int soma(int a, int b) {
    int resultado = a + b;
    return resultado;
}

int fatorial(int num) {
    if (num < 1) return -1;
    int f;
    for (int i = 1; i <= num; i++) {
        f *= i;
    }
    return f;
}