Done: Zig zagged up a slate rock face that my shoes kept slipping down because of the rain and then snow at the peak. On a 4 day trek, we hit the peak on the 3rd day. The peak was called Punta Union and was 4750m (15585 ft) high.Thank god for the donkeys because altitude sickness is real. I was very ill-equiped with no waterproof clothing other than a poncho. I had to survive with an undershirt, shirt and hoodie. Thank God I bought a scarf, beanie and gloves for 20 soles ($6). It probably saved me.