#include <stdio.h>

int main(void) {
int num,data[32],i=0;

if (scanf("%d", &num) != 1) {
return 1; 
}

if (num == 0) {
printf("0\n");
return 0;
}


while (num > 0) {
data[i] = num % 2; 
num = num / 2;       
i++;                 
}


printf("2進数: ");
for (int j = i - 1; j >= 0; j--) {
printf("%d", data[j]);
}
printf("\n");

    return 0;
}