#include <stdio.h>

double avg(int a[]){
	int i,sum;
	double b;
	sum = 0;
	b = 0;
	
	for(i = 0;i < 3;i ++){
		sum += a[i];
		b = sum / 3;
	}
	
	return (b);
}
int main(void) {
    int a[3],i,b;
    
    for(i = 0;i < 3;i ++){
    	scanf("%d",&a[i]);
    }
    
    return (a);
    
    printf("%d",b);
	return 0;
}