#include    <stdio.h>

int main() {
    int nr;
    scanf("%d", &nr);

    // Varianta cu For
    int sumaFor = 0;
    for(int i = 1; i <= nr; i++) {
        if(i % 2 == 0) {
            sumaFor = sumaFor - (1 / (i * i));
        } else {
            sumaFor = sumaFor + (1 / (i * i));
        }
    }

    // Varianta cu While
    int sumaWhile = 0;
    int i = 1;
    while(i <= nr) {
        if(i % 2 == 0) {
            sumaWhile = sumaWhile - (1 / (i * i));
        } else {
            sumaWhile = sumaWhile + (1 / (i * i));
        }
        i = i + 1;
    }

    // Varianta cu While
    int sumaDoWhile = 0;
    i = 1;
    do {
        if(i % 2 == 0) {
            sumaDoWhile = sumaDoWhile - (1 / (i * i));
        } else {
            sumaDoWhile = sumaDoWhile + (1 / (i * i));
        }
        i = i + 1;
    } while (i < nr);

    printf("For: %d\nWhile: %d\nDo While: %d", sumaFor, sumaWhile, sumaDoWhile);
    return 0;
}