#include <stdlib.h>
#include <stdio.h>

int main(){
    int counter = 0;
    FILE *fi;
    FILE *fo;
    char c = '\\';
    fi = fopen("input.txt","r");
    while (c != EOF){
        c = fgetc(fi);
        if (c == '\n'){
            counter++;
        }
    }
    fclose(fi);
    fo = fopen("output.txt","w");
    fprintf(fo,"%d",counter);
    fclose(fo);
    return 0;
}