#include <stdio.h>

main()
{
     int n, i, syou, amari[32];

     printf("n(10進数) = ");
     scanf("%d", &n);

     for(i=1;n !=0; ++i){
         syou = n/2;
         amari[i] = n % 2;
         n = syou;
     }
    
     printf("2進数では");
     for (--i; i>0; --i){
        printf("%d", amari[i]);
     }
     printf("\n");

     exit(0);
}