**TI82**
Helpful if your stuck in space ù ASTRO ù ÷ æ*MAIN*+*INPUT)VARS*+1+*RUN*+2?Ö1?á?Þ*BjBREATH)RATEL*+*OjO2)TANKL*+*MjYOUR)WTKG*+*DjDISTM*?ÝB?ÝO?ÝM?ÝD?Ü*O2)VMƒSj¯*+E?Ö2?*OqXƒBqMqXƒXV*^?Þ*LET)OUT)O2Lj*?(^+X+0+:5Y?ÞY?EMqYV?Þ*YOUR)VMƒSj*+V?DƒVT?Þ*HOW)LONGjSj*+T?ZI