#include
     
      inline int xchg(unsigned char n)//这种是利用位运算{    char up = n << 4;    char low = n >> 4;    char a=up+low;    return a;}inline int xchg(unsigned char n)//这种是直接利用二进制特性{    char a;    a=n%16*16+n/16;    return a;}int main(){    unsigned char n;    scanf("%d", &n);    n=xchg(n);    printf("%d\n", n);    return 0;}