/*
TASK:edi
LANG:C++
*/

#include<iostream>
using namespace std;
int main(){
           
    long s[100000],i,n;
cin>>n;
for(i=0;i<=n;i++)
cin>>s[i];
cout<<(s[1]+s[2]+s[3]+s[4]+s[5]+s[6]+s[7]+s[8]+s[9]+s[10]+s[11]+s[12]+s[13]+s[14]+s[15]+s[16]+s[17]+s[18]+s[19]+s[20]+s[21]+s[22]+s[23]+s[24]+s[25]+s[26]+s[27]+s[28]+s[29]+s[30]+s[31]+s[32]+s[33]+s[34]+s[35]+s[36]+s[37]+s[38]+s[39]+s[40]+s[41]+s[42]+s[43]+s[44]+s[45]+s[46]+s[47]+s[48]+s[49]+s[50]+s[51]+s[52]+s[53]+s[54]+s[55]+s[56]+s[57]+s[58]+s[59]+s[60]+s[61]+s[62]+s[63]+s[64]+s[65]+s[66]+s[67]+s[68]+s[69]+s[70]+s[71]+s[72]+s[73]+s[74]+s[75]+s[76]+s[77]+s[78]+s[79]+s[80]+s[81]+s[82]+s[83]+s[84]+s[85]+s[86]+s[87]+s[88]+s[89]+s[90]+s[91]+s[92]+s[93]+s[94]+s[95]+s[96]+s[97]+s[98]+s[99]+s[100])/n;
 return 0;
}
