#include <stdio.h>
int main() {
	int a[10];
	int b, s;
	for (b=0; b<10; b++) {
		scanf ("%d ", &a[b]);
	}
	double average;
	for (b=0; b<9; b++) {
		s=s+a[b];
	}
	average=s/10.0;
	printf ("%lf", average);
}
```