#include <stdio.h>

int main(){
    int x = 8, y = 49, z = 1;

    printf("1: ");    
    if (x < 7 && y > 50 || z < 2) printf("true.\n");else printf("false.\n");
    printf("2: ");
    if (((x < 7) && (y > 50)) || (z < 2)) printf("true.\n");else printf("false.\n");
    printf("3: ");
    if ((x < 7) && ((y > 50) || (z < 2)) printf("true.\n");else printf("false.\n");
    
    int pause;
    scanf("%d",&pause);
    return 0;
}