#include <stdio.h>

int main(){
    int red, blue, white;
    scanf("%d%d%d",&red,&blue,&white);

    while(0 < white){
        if(red > blue){
            blue++;
        }else{
            red++;
        }
        white--;
    }

    if(red > blue){
        printf("%d",blue);
    }else{
        printf("%d",red);
    }
}