#import <Foundation/Foundation.h>

int main (int argc, char *argv[])
{
    NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
    int n, number, triangularNumber;

    NSLog (@"Ktr liczb trjktn chcesz sprawdzi?");
    scanf ("%i", &number);

    triangularNumber = 0;

    for ( n = 1; n <= number; ++n )
        triangularNumber += n;

    NSLog (@"Liczba trjktna numer %i wynosi %i\n", number, triangularNumber);

    [pool drain];
    return 0;
}