# MATLAB: Number of samples – how to calculate it

sample frequency

Hello everybody! I am writing a code to play DTMF tones, and need to play them for 0.5 seconds. My question is: how to calculate the number of samples [n]? I tried to apply fs/f0 but the result was a small range. I am using FS = 8000 Hz. Thank you!!!
fs = 8000; % Below I tried to use 5000 just for testing my code, and worked well:       n = [0:5000];tone0 = (1.5)*cos(0.73906*n)+(1.5)*cos(1.04929*n);