#include <stdio.h>
__int64 FindNumber(int i) {
    __int64 Number = i;
    __int64 Prev = 0;
    __int64 Step = 1;
    __int64 Digit = i;
    do {
        Step *= 10;
        Number += Step * ((Digit * 2) % 10 + Prev);
        Prev = (Digit * 2) / 10;
        Digit = Number / Step;
    } while ((Digit != i) || (Prev != 0));
    Number -= Digit * Step;
    return Number;
}
void GetArray(__int64 *MyArr) {
    printf_s("This program searches for the smallest number, which, when you rearrange the last digit\n"
                          "to the first one, is twice as large as the original\n");
    printf_s("This is the list of required numbers :\n");
    for (int i = 0; i < 7; i++) {
        MyArr[i] = FindNumber(i + 2);
        printf_s("%d : %I64d\n", i + 1, MyArr[i]);
    }
}
void ShowAnswer(__int64 *MyArray) {
    __int64 Min = MyArray[6];
    for (int i = 0; i < 7; i++)
        if (MyArray[i] < Min)
            Min = MyArray[i];
    printf_s("Minimum required number is : %I64d", Min);
}
int main(){
    __int64 ArrayNumber[7];
    GetArray(ArrayNumber);
    ShowAnswer(ArrayNumber);
}