Вычислите значение выражения : 1/3•5+2/5•7+ •••+ 2/29•31

1/3*5+2/5*7+2/29*31
1. (1//3)*5+2/5*7+2/29*31
2. (5//3)+2/5*7+2/29*31
3. (5//3)+0.4*7+2/29*31
4. (5//3)+2.8+2/29*31
5. (67//15)+2/29*31
6. (67//15)+(62//29)*31
7. (67//15)+(62//29)
8. 2873//435