#include<stdio.h>

int main(){
    
    int X,Y,Z;
    int count = 0;
    scanf("%d %d %d",&X,&Y,&Z);
    
    while(Z>0){
        if( X<Y )   X++;
        else        Y++;
        Z--;
    }
    
    count = X<Y?X:Y;
    
    printf("%d",count);
    
    return 0;
}