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#include <bits/stdc++.h>
using namespace std;
int main() {
int n, cnt = 0;
char a[50], b[50];
double temp, sum = 0.0;
cin >> n;
for ( int i = 0; i < n; i++) {
scanf ( "%s" , a);
sscanf (a, "%lf" , &temp); //从一个字符串中读进与指定格式相符的数据
sprintf (b, "%.2lf" ,temp); //字符串格式化命令,主要功能是把格式化的数据写入某个字符串中
int flag = 0;
for ( int j = 0; j < strlen (a); j++) {
if (a[j] != b[j]) {
flag = 1;
}
}
if (flag || temp < -1000 || temp > 1000) {
printf ( "ERROR: %s is not a legal number\n" , a);
continue ;
} else {
sum += temp;
cnt++;
}
}
if (cnt == 1) {
printf ( "The average of 1 number is %.2lf" , sum);
} else if (cnt > 1) {
printf ( "The average of %d numbers is %.2lf" , cnt, sum / cnt);
} else {
printf ( "The average of 0 numbers is Undefined" );
}
return 0;
}
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