Hangdian oj, lenguaje C, depúrelo

#includelt;stdio.hgt;

int?gcd(int?a, int?b)

{int?r; ) {a=b; b=r; } retorno?b;

}

int?main()

{?int?n, k, a, b; while(scanf("d", amp; n)==1) {?scanf("d", amp; a);

mientras(--n)

{?scanf("d",amp;b); a=a*b/gcd(a,b);

}

printf("d\n ", a); } retorno?0;

}