aoc2020

#include <fstream>
#define ULL unsigned long long int
using namespace std;

ULL cmmmc(ULL a,ULL b)
{
    ULL x,y,r,p;
    p=a*b;
    x=a;
    y=b;
    while(y!=0)
        r=x%y,x=y,y=r;
    return p/x;
}

int main()
{
    int n;
    ifstream f("aoc2020.in");
    f>>n;
    ULL a,b;
    f>>a>>b;
    ULL CMMMC=cmmmc(a,b);
    for(int i=3;i<=n;++i)
        f>>a,CMMMC=cmmmc(a,CMMMC);
    ofstream g("aoc2020.out");
    g<<CMMMC;
    return 0;
}