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

int main() {

    int matrices = 0;
    fscanf(stdin, "%d", &matrices);

    int R=0, C=0;
    fscanf(stdin, "%d %d", &R, &C);
    double **result = mread(stdin, &R, &C);

    while(matrices>1) {
        int nextR=0, nextC=0;
        fscanf(stdin, "%d %d", &nextR, &nextC);
        double **next = mread(stdin, &nextR, &nextC);

        result = mmult(R,C,result,nextR,nextC,next);
        xfree(nextR,nextC,next);
        C=nextC;

        matrices--;
    }

    mwrite(stdout,R,C,result);
    xfree(R,C,result);

}