#include <stdio.h>

int main(void)
{
    long n,z1,zn,i;
    scanf("%ld",&n);
    scanf("%ld",&z1);
    for(i=1;i<n;i++){
        if(i>n-2)scanf("%ld",&zn);
        else scanf("%*ld");
    }
    printf("%ld/%ld",zn,z1);
    return 0;
}