#include <stdio.h>
#include <stdlib.h>

int fyo, myo;
int main()
{
    int yyo, gmyo, gfyo;
    myo = -1;
    printf("How old are you?\n");
    scanf("%d",&yyo);
    if (yyo > 0){
    printf("You are %d years old\n", yyo);
    }
    else {
        printf("You is not exist.\n");
    }
    printf("How old is your father?\n");
    scanf("%d",&fyo);
    if (fyo > 0) {
        if (fyo > yyo) {
            printf("Your father is %d years old\n", fyo);
            printf("Your father was %d years old, when you was born.\n", fyo-yyo);
        }
        else {
            printf("Your father is young than you :D\n", fyo);
        }
    }
    else {
        printf("Your father is not exist.\n");
    }
    do {
        printf("How old is your mother?\n");
        scanf("%d",&myo);
        if (myo < 0 || myo < yyo) {
            printf("It's not correct.\n");
        }
    } while (myo < 0 || myo < yyo);
    switch (myo) {
        case 77: printf("Your mother and father are the same age"); break;
        default: printf("Your mother is %d years old\n", myo);
        printf("Your mother was %d years old, when you was born.\n", myo-yyo); break;
    }
    return 0;
}