#include <stdio.h>
int main(void) {
int a, x, y, z, REST, min;
scanf("%d", &a);
x = a / 100;
REST = a % 100;
y = REST / 10;
REST = (a % 100) % 10;
z = REST;
if (x<=y&&x<=z)
min=x;
else if(y<=x&&y<=z)
min=y
else if(z<=x&&z<=y)
min=z
printf("%d",min)
return 0;
}