#include<iostream>
using namespace std;    
int p[100][100];  
void Test(void){
	int m,n,i,j,k,sg;
	int count=0;
	FILE *fp1,*fp2;
	fp1=fopen("input.txt","r");
	fp2=fopen("output.txt","w");
	fscanf(fp1,"%d %d",&m,&n);
	if(m==0){
		fprintf(fp2,"%d\n",count);
	}
	else{
		for(i=0;i<n;i++)
			fscanf(fp1,"%d",&p[0][i]);
		count++;
		for(i=1;i<m;i++){
			for(j=0;j<n;j++)
			fscanf(fp1,"%d",&p[count][j]);
			sg=0;
			for(k=0;k<count && sg==0;k++){
				sg=1;
				for(j=0;j<n;j++)
					if(p[count][j]!=p[k][j]){
						sg=0;
						break;
					}
			}
			if(sg==0)
				count++;
		}
		fprintf(fp2,"%d\n",count);
	}
	fclose(fp1);
	fclose(fp2);
}
void main(){
	Test();
}