#include<stdio.h>
int main(){
int a,b,c;
scanf("%d",&a);
scanf("%d",&b);
scanf("%d",&c);
if (int(a >= 1 ||a < =0 && int b >= 1 || b <= 0 && int c >= 1 || c <= 0)){
    printf("Invalid input");
}
else if(int(a == 1 && b == 1 && c == 1)){
    printf("true");
}
 else if(int(a == 0 && b == 0 && c == 0)){
        printf("false");
   }
   return 0;
}