#include <stdio.h>
int main(void){
	int red, blue, white;
	scanf("%d%d%d",&red, &blue, &white);
	
	while(white != 0){
		if(red < blue){
			red++;
			white--;
		}else{
			blue++;
			white--;
		}
	}
	if(red < blue){
		printf("%d",red);
	}else{
		printf("%d",blue);
	}
}