#include<stdio.h>
#include<string.h>
#include<math.h>
int main()
{
long long int arr[16],arr1[16],arr2[16];
long long int i,j,k,l,a,b,c,d,mod,mod1,sum;
while(scanf("%lld%lld",&a,&b)==2)
{
memset(arr,0,sizeof(arr));
memset(arr1,0,sizeof(arr1));
i=15;
j=15;
while(a>0)
{
mod=a%2;
arr[i]=mod;
i--;
a=a/2;
}
while(b>0)
{
mod1=b%2;
arr1[j]=mod1;
j--;
b=b/2;
}
for(k=15;k>=0;k--)
{
if((arr[k]==1&&arr1[k]==1)||(arr[k]==0&&arr1[k]==0))
{
arr2[k]=0;
}
else
{
arr2[k]=1;
}
}
c=0;
sum=0;
for(l=15;l>=0;l--)
{
d=arr2[l]*pow(2,c);
c++;
sum=sum+d;
}
printf("%lld\n",sum);
}
return 0;
}
#include<string.h>
#include<math.h>
int main()
{
long long int arr[16],arr1[16],arr2[16];
long long int i,j,k,l,a,b,c,d,mod,mod1,sum;
while(scanf("%lld%lld",&a,&b)==2)
{
memset(arr,0,sizeof(arr));
memset(arr1,0,sizeof(arr1));
i=15;
j=15;
while(a>0)
{
mod=a%2;
arr[i]=mod;
i--;
a=a/2;
}
while(b>0)
{
mod1=b%2;
arr1[j]=mod1;
j--;
b=b/2;
}
for(k=15;k>=0;k--)
{
if((arr[k]==1&&arr1[k]==1)||(arr[k]==0&&arr1[k]==0))
{
arr2[k]=0;
}
else
{
arr2[k]=1;
}
}
c=0;
sum=0;
for(l=15;l>=0;l--)
{
d=arr2[l]*pow(2,c);
c++;
sum=sum+d;
}
printf("%lld\n",sum);
}
return 0;
}
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