#include <stdio.h>
#include <stdlib.h>


int replicateSign(int x) {
    int sign=x>>31;

    // replicate the bit into the entire int
    int tmp = sign|(sign<<1);       // 2lsb
    tmp = tmp|(tmp<<2);             // 4lsb
    tmp = tmp|(tmp<<4);             // 8lsb
    tmp = tmp|(tmp<<8);             // 16lsb
    tmp = tmp|(tmp<<16);            // 32lsb
    return tmp;
}
int abs1(int x) {
    int signMask=replicateSign(x);
    int negX=-x;

    // apply masks; if sign bit is 1 (meaning negative), we want -x,
    // and if it is 0 we want x
    return (signMask&negX) | ((~signMask)&x);
}
int max(int a,int b) {
    return (a+b+abs1(a-b))/2;
}
int main(int argc, char** argv) {
    if(argc<3) {
        fprintf(stderr,"usage: %s a b\n",argv[0]);
        return 1;
    }

    printf("%d\n", max(atoi(argv[1]), atoi(argv[2])));
    return 0;
}