#include <stdio.h>
enum {SIZE = 5}
int main() {
int A[SIZE];
float average = 0.0;
for (int i = 0; i < SIZE; i++) {
scanf("%d ", &A[i]);
}
for (int i = 0; i < SIZE; i++) {
average += A[i];
}
avarage = average / SIZE;
printf("%d", average);
return 0;
}