What does "+6 errors" outputted after ping execution mean?

Issue

• What does "+6 errors" outputted after ping execution mean?

# ping -c 10 -i 2 192.168.100.181
PING 192.168.100.181 (192.168.100.181) 56(84) bytes of data.
From 192.168.100.198 icmp_seq=5 Destination Host Unreachable
From 192.168.100.198 icmp_seq=6 Destination Host Unreachable
From 192.168.100.198 icmp_seq=7 Destination Host Unreachable
From 192.168.100.198 icmp_seq=8 Destination Host Unreachable
From 192.168.100.198 icmp_seq=9 Destination Host Unreachable
From 192.168.100.198 icmp_seq=10 Destination Host Unreachable
64 bytes from 192.168.100.181: icmp_seq=1 ttl=64 time=23000 ms
64 bytes from 192.168.100.181: icmp_seq=2 ttl=64 time=23000 ms
64 bytes from 192.168.100.181: icmp_seq=3 ttl=64 time=23042 ms

--- 192.168.100.181 ping statistics ---
10 packets transmitted, 3 received, +6 errors, 70% packet loss, time 28001ms
rtt min/avg/max/mdev = 23000.444/23014.640/23042.507/20.091 ms, pipe 10