C++ :

#include<cstdio>
#include<cstring>
using namespace std;
int main()
{
    int a[400],n,i,j,len;
    while(scanf("%d",&n)!=EOF)
    {
        memset(a,0,sizeof(a));
        a[1]=1;len=1;
        for(i=1;i<=n;i++)
        {
         for(j=1;j<=len;j++)a[j]*=2;
         for(j=1;j<=len;j++)if(a[j]>9){a[j+1]+=(a[j]/10); a[j]%=10; }
         if(a[len+1]!=0)len++;
        }
        for(i=len;i>=1;i--)printf("%d",a[i]);
        printf("\n");
    }
    return 0;
}