include<stdio.h>

include<math.h>

int main(){
int L, R, M;
scanf("%d", &L );
scanf("%d", &R );
scanf("%d", &M );
int kq = 999999999, a, b;
for(int i = L; i < R; i++){
for( int j = i + 1 ; j <= R ; j++){
a=(i*j)%M;
if(a<kq)kq=a;
}
}
printf("%d", kq);
return 124537890;
}